31002103120 has 20 divisors (see below), whose sum is σ = 72079889940. Its totient is φ = 12400841216.

The previous prime is 31002103081. The next prime is 31002103129. The reversal of 31002103120 is 2130120013.

It can be written as a sum of positive squares in 2 ways, for example, as 3685946944 + 27316156176 = 60712^2 + 165276^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×31002103120² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31002103120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31002103129) 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, 193763065 + ... + 193763224.

It is an arithmetic number, because the mean of its divisors is an integer number (3603994497).

Almost surely, 2^31002103120 is an apocalyptic number.

It is an amenable number.

31002103120 is an abundant number, since it is smaller than the sum of its proper divisors (41077786820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31002103120 is a wasteful number, since it uses less digits than its factorization.

31002103120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387526302 (or 387526296 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31002103120 its reverse (2130120013), we get a palindrome (33132223133).

The spelling of 31002103120 in words is "thirty-one billion, two million, one hundred three thousand, one hundred twenty".