31996702091 has 2 divisors, whose sum is σ = 31996702092. Its totient is φ = 31996702090.

The previous prime is 31996702063. The next prime is 31996702109. The reversal of 31996702091 is 19020769913.

Together with next prime (31996702109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31996702091 - 2¹⁰ = 31996701067 is a prime.

It is not a weakly prime, because it can be changed into another prime (31996702021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15998351045 + 15998351046.

It is an arithmetic number, because the mean of its divisors is an integer number (15998351046).

Almost surely, 2^31996702091 is an apocalyptic number.

31996702091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31996702091 is an equidigital number, since it uses as much as digits as its factorization.

31996702091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 47.

The spelling of 31996702091 in words is "thirty-one billion, nine hundred ninety-six million, seven hundred two thousand, ninety-one".