31000111109972 has 48 divisors (see below), whose sum is σ = 55109063318400. Its totient is φ = 15256571043840.

The previous prime is 31000111109971. The next prime is 31000111110019. The reversal of 31000111109972 is 27990111100013.

It is a super-2 number, since 2×31000111109972² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000111109971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156910772 + ... + 157108212.

It is an arithmetic number, because the mean of its divisors is an integer number (1148105485800).

Almost surely, 2^{31000111109972} is an apocalyptic number.

It is an amenable number.

31000111109972 is a deficient number, since it is larger than the sum of its proper divisors (24108952208428).

31000111109972 is a wasteful number, since it uses less digits than its factorization.

31000111109972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199856 (or 199854 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 35.

Adding to 31000111109972 its reverse (27990111100013), we get a palindrome (58990222209985).

The spelling of 31000111109972 in words is "thirty-one trillion, one hundred eleven million, one hundred nine thousand, nine hundred seventy-two".