31371123697 has 2 divisors, whose sum is σ = 31371123698. Its totient is φ = 31371123696.

The previous prime is 31371123583. The next prime is 31371123703. The reversal of 31371123697 is 79632117313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27556332001 + 3814791696 = 166001^2 + 61764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31371123697 is a prime.

It is not a weakly prime, because it can be changed into another prime (31371123397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15685561848 + 15685561849.

It is an arithmetic number, because the mean of its divisors is an integer number (15685561849).

Almost surely, 2^31371123697 is an apocalyptic number.

It is an amenable number.

31371123697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31371123697 is an equidigital number, since it uses as much as digits as its factorization.

31371123697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 43.

The spelling of 31371123697 in words is "thirty-one billion, three hundred seventy-one million, one hundred twenty-three thousand, six hundred ninety-seven".