31794985639 has 2 divisors, whose sum is σ = 31794985640. Its totient is φ = 31794985638.

The previous prime is 31794985637. The next prime is 31794985657. The reversal of 31794985639 is 93658949713.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31794985639 - 2¹ = 31794985637 is a prime.

It is a super-2 number, since 2×31794985639² (a number of 22 digits) contains 22 as substring.

Together with 31794985637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31794985633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15897492819 + 15897492820.

It is an arithmetic number, because the mean of its divisors is an integer number (15897492820).

Almost surely, 2^31794985639 is an apocalyptic number.

31794985639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31794985639 is an equidigital number, since it uses as much as digits as its factorization.

31794985639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44089920, while the sum is 64.

The spelling of 31794985639 in words is "thirty-one billion, seven hundred ninety-four million, nine hundred eighty-five thousand, six hundred thirty-nine".