31693271639 has 2 divisors, whose sum is σ = 31693271640. Its totient is φ = 31693271638.

The previous prime is 31693271573. The next prime is 31693271641. The reversal of 31693271639 is 93617239613.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31693271639 is a prime.

Together with 31693271641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31693276639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15846635819 + 15846635820.

It is an arithmetic number, because the mean of its divisors is an integer number (15846635820).

Almost surely, 2^31693271639 is an apocalyptic number.

31693271639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31693271639 is an equidigital number, since it uses as much as digits as its factorization.

31693271639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 50.

The spelling of 31693271639 in words is "thirty-one billion, six hundred ninety-three million, two hundred seventy-one thousand, six hundred thirty-nine".