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30200031 = 3218118539
BaseRepresentation
bin111001100110…
…1000011011111
32002211022122200
41303031003133
530212400111
62555142543
7514460511
oct163150337
962738580
1030200031
1116057804
12a144a53
136345054
144021bb1
1529b8256
hex1ccd0df

30200031 has 12 divisors (see below), whose sum is σ = 43865640. Its totient is φ = 20021040.

The previous prime is 30200021. The next prime is 30200033. The reversal of 30200031 is 13000203.

Adding to 30200031 its reverse (13000203), we get a palindrome (43200234).

It is a happy number.

It is not a de Polignac number, because 30200031 - 25 = 30199999 is a prime.

It is a super-2 number, since 2×302000312 = 1824083744801922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 30199986 and 30200022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30200033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7641 + ... + 10898.

It is an arithmetic number, because the mean of its divisors is an integer number (3655470).

Almost surely, 230200031 is an apocalyptic number.

30200031 is a deficient number, since it is larger than the sum of its proper divisors (13665609).

30200031 is a wasteful number, since it uses less digits than its factorization.

30200031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18726 (or 18723 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 30200031 is about 5495.4554861267. The cubic root of 30200031 is about 311.4123244838.

The spelling of 30200031 in words is "thirty million, two hundred thousand, thirty-one".

Divisors: 1 3 9 181 543 1629 18539 55617 166851 3355559 10066677 30200031