31023121031 has 8 divisors (see below), whose sum is σ = 36178567200. Its totient is φ = 26591246304.

The previous prime is 31023121021. The next prime is 31023121037. The reversal of 31023121031 is 13012132013.

It is not a de Polignac number, because 31023121031 - 2¹⁸ = 31022858887 is a prime.

It is a super-2 number, since 2×31023121031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023121037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45222866 + ... + 45223551.

It is an arithmetic number, because the mean of its divisors is an integer number (4522320900).

Almost surely, 2^31023121031 is an apocalyptic number.

31023121031 is a deficient number, since it is larger than the sum of its proper divisors (5155446169).

31023121031 is an frugal number, since it uses more digits than its factorization.

31023121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90446438 (or 90446424 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31023121031 its reverse (13012132013), we get a palindrome (44035253044).

The spelling of 31023121031 in words is "thirty-one billion, twenty-three million, one hundred twenty-one thousand, thirty-one".