31231326310091 has 2 divisors, whose sum is σ = 31231326310092. Its totient is φ = 31231326310090.

The previous prime is 31231326310021. The next prime is 31231326310097. The reversal of 31231326310091 is 19001362313213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31231326310091 is a prime.

It is not a weakly prime, because it can be changed into another prime (31231326310097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615663155045 + 15615663155046.

It is an arithmetic number, because the mean of its divisors is an integer number (15615663155046).

Almost surely, 2^{31231326310091} is an apocalyptic number.

31231326310091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231326310091 is an equidigital number, since it uses as much as digits as its factorization.

31231326310091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 31231326310091 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty-six million, three hundred ten thousand, ninety-one".