31132210231 has 2 divisors, whose sum is σ = 31132210232. Its totient is φ = 31132210230.

The previous prime is 31132210199. The next prime is 31132210243. The reversal of 31132210231 is 13201223113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31132210231 - 2⁵ = 31132210199 is a prime.

It is a super-2 number, since 2×31132210231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31132210199 and 31132210208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31132210271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566105115 + 15566105116.

It is an arithmetic number, because the mean of its divisors is an integer number (15566105116).

Almost surely, 2^31132210231 is an apocalyptic number.

31132210231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132210231 is an equidigital number, since it uses as much as digits as its factorization.

31132210231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31132210231 its reverse (13201223113), we get a palindrome (44333433344).

The spelling of 31132210231 in words is "thirty-one billion, one hundred thirty-two million, two hundred ten thousand, two hundred thirty-one".