31000120402432 has 20 divisors (see below), whose sum is σ = 61939693695726. Its totient is φ = 15500060200960.

The previous prime is 31000120402429. The next prime is 31000120402439. The reversal of 31000120402432 is 23420402100013.

It can be written as a sum of positive squares in only one way, i.e., 17271139092736 + 13728981309696 = 4155856^2 + 3705264^2 .

It is a super-2 number, since 2×31000120402432² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000120402439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30273554569 + ... + 30273555592.

Almost surely, 2^{31000120402432} is an apocalyptic number.

31000120402432 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31000120402432 is a deficient number, since it is larger than the sum of its proper divisors (30939573293294).

31000120402432 is an frugal number, since it uses more digits than its factorization.

31000120402432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60547110179 (or 60547110163 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31000120402432 its reverse (23420402100013), we get a palindrome (54420522502445).

The spelling of 31000120402432 in words is "thirty-one trillion, one hundred twenty million, four hundred two thousand, four hundred thirty-two".