31102012231 has 2 divisors, whose sum is σ = 31102012232. Its totient is φ = 31102012230.

The previous prime is 31102012181. The next prime is 31102012259. The reversal of 31102012231 is 13221020113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31102012231 - 2¹¹ = 31102010183 is a prime.

It is a super-2 number, since 2×31102012231² (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 (31102013231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551006115 + 15551006116.

It is an arithmetic number, because the mean of its divisors is an integer number (15551006116).

Almost surely, 2^31102012231 is an apocalyptic number.

31102012231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31102012231 is an equidigital number, since it uses as much as digits as its factorization.

31102012231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31102012231 its reverse (13221020113), we get a palindrome (44323032344).

The spelling of 31102012231 in words is "thirty-one billion, one hundred two million, twelve thousand, two hundred thirty-one".