31315210231 has 2 divisors, whose sum is σ = 31315210232. Its totient is φ = 31315210230.

The previous prime is 31315210211. The next prime is 31315210253. The reversal of 31315210231 is 13201251313.

It is an a-pointer prime, because the next prime (31315210253) can be obtained adding 31315210231 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31315210231 - 2⁹ = 31315209719 is a prime.

It is a super-2 number, since 2×31315210231² (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 (31315210211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657605115 + 15657605116.

It is an arithmetic number, because the mean of its divisors is an integer number (15657605116).

Almost surely, 2^31315210231 is an apocalyptic number.

31315210231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31315210231 is an equidigital number, since it uses as much as digits as its factorization.

31315210231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 31315210231 its reverse (13201251313), we get a palindrome (44516461544).

The spelling of 31315210231 in words is "thirty-one billion, three hundred fifteen million, two hundred ten thousand, two hundred thirty-one".