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30325021 = 157193153
BaseRepresentation
bin111001110101…
…1100100011101
32010001200002221
41303223210131
530230400041
63001545341
7515521066
oct163534435
963050087
1030325021
1116132701
12a1a5251
136389bcc
14405556d
1529e02d1
hex1ceb91d

30325021 has 4 divisors (see below), whose sum is σ = 30518332. Its totient is φ = 30131712.

The previous prime is 30324989. The next prime is 30325027. The reversal of 30325021 is 12052303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12052303 = 17708959.

It can be written as a sum of positive squares in 2 ways, for example, as 13060996 + 17264025 = 3614^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 30325021 - 25 = 30324989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30324986 and 30325004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30325027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96420 + ... + 96733.

It is an arithmetic number, because the mean of its divisors is an integer number (7629583).

Almost surely, 230325021 is an apocalyptic number.

It is an amenable number.

30325021 is a deficient number, since it is larger than the sum of its proper divisors (193311).

30325021 is a wasteful number, since it uses less digits than its factorization.

30325021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193310.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 30325021 is about 5506.8158676317. The cubic root of 30325021 is about 311.8413511032.

Adding to 30325021 its reverse (12052303), we get a palindrome (42377324).

The spelling of 30325021 in words is "thirty million, three hundred twenty-five thousand, twenty-one".

Divisors: 1 157 193153 30325021