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30151081 = 174192
BaseRepresentation
bin111001100000…
…1000110101001
32002201211111201
41303001012221
530204313311
62554124201
7514165012
oct163010651
962654451
1030151081
1116023a54
12a120661
13632899c
14400c009
1529a89c1
hex1cc11a9

30151081 has 15 divisors (see below), whose sum is σ = 33810321. Its totient is φ = 26883936.

The previous prime is 30151067. The next prime is 30151123. The reversal of 30151081 is 18015103.

The square root of 30151081 is 5491.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 9357481 + 20793600 = 3059^2 + 4560^2 .

It is not a de Polignac number, because 30151081 - 25 = 30151049 is a prime.

It is a super-2 number, since 2×301510812 = 1818175370937122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30151481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1586890 + ... + 1586908.

Almost surely, 230151081 is an apocalyptic number.

30151081 is the 5491-st square number.

30151081 is the 2746-th centered octagonal number.

It is an amenable number.

30151081 is a deficient number, since it is larger than the sum of its proper divisors (3659240).

30151081 is an frugal number, since it uses more digits than its factorization.

30151081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The cubic root of 30151081 is about 311.2439816474.

Adding to 30151081 its reverse (18015103), we get a palindrome (48166184).

It can be divided in two parts, 3015 and 1081, that added together give a 12-th power (4096 = 212).

The spelling of 30151081 in words is "thirty million, one hundred fifty-one thousand, eighty-one".