31231109971 has 2 divisors, whose sum is σ = 31231109972. Its totient is φ = 31231109970.

The previous prime is 31231109963. The next prime is 31231110017. The reversal of 31231109971 is 17990113213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31231109971 - 2³ = 31231109963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31231109971.

It is not a weakly prime, because it can be changed into another prime (31231109771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615554985 + 15615554986.

It is an arithmetic number, because the mean of its divisors is an integer number (15615554986).

Almost surely, 2^31231109971 is an apocalyptic number.

31231109971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231109971 is an equidigital number, since it uses as much as digits as its factorization.

31231109971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The spelling of 31231109971 in words is "thirty-one billion, two hundred thirty-one million, one hundred nine thousand, nine hundred seventy-one".