31312111031 has 2 divisors, whose sum is σ = 31312111032. Its totient is φ = 31312111030.

The previous prime is 31312111021. The next prime is 31312111037. The reversal of 31312111031 is 13011121313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31312111031 - 2¹⁰ = 31312110007 is a prime.

It is a super-2 number, since 2×31312111031² (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 (31312111037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656055515 + 15656055516.

It is an arithmetic number, because the mean of its divisors is an integer number (15656055516).

Almost surely, 2^31312111031 is an apocalyptic number.

31312111031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312111031 is an equidigital number, since it uses as much as digits as its factorization.

31312111031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31312111031 its reverse (13011121313), we get a palindrome (44323232344).

The spelling of 31312111031 in words is "thirty-one billion, three hundred twelve million, one hundred eleven thousand, thirty-one".