31111121031 has 16 divisors (see below), whose sum is σ = 43941325824. Its totient is φ = 19511928704.

The previous prime is 31111121021. The next prime is 31111121047. The reversal of 31111121031 is 13012111113.

It is a de Polignac number, because none of the positive numbers 2^k-31111121031 is a prime.

It is a super-2 number, since 2×31111121031² (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 31111121031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31111121011) 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, 21591 + ... + 250376.

It is an arithmetic number, because the mean of its divisors is an integer number (2746332864).

Almost surely, 2^31111121031 is an apocalyptic number.

31111121031 is a deficient number, since it is larger than the sum of its proper divisors (12830204793).

31111121031 is a wasteful number, since it uses less digits than its factorization.

31111121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274230.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 31111121031 its reverse (13012111113), we get a palindrome (44123232144).

The spelling of 31111121031 in words is "thirty-one billion, one hundred eleven million, one hundred twenty-one thousand, thirty-one".