31123012031 has 2 divisors, whose sum is σ = 31123012032. Its totient is φ = 31123012030.

The previous prime is 31123011991. The next prime is 31123012043. The reversal of 31123012031 is 13021032113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31123012031 - 2³⁴ = 13943142847 is a prime.

It is a super-2 number, since 2×31123012031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123012631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561506015 + 15561506016.

It is an arithmetic number, because the mean of its divisors is an integer number (15561506016).

Almost surely, 2^31123012031 is an apocalyptic number.

31123012031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123012031 is an equidigital number, since it uses as much as digits as its factorization.

31123012031 is an evil number, because the sum of its binary digits is even.

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

Adding to 31123012031 its reverse (13021032113), we get a palindrome (44144044144).

The spelling of 31123012031 in words is "thirty-one billion, one hundred twenty-three million, twelve thousand, thirty-one".