19397739631 has 2 divisors, whose sum is σ = 19397739632. Its totient is φ = 19397739630.

The previous prime is 19397739509. The next prime is 19397739643. The reversal of 19397739631 is 13693779391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19397739631 - 2¹⁵ = 19397706863 is a prime.

It is a super-2 number, since 2×19397739631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19397739661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9698869815 + 9698869816.

It is an arithmetic number, because the mean of its divisors is an integer number (9698869816).

Almost surely, 2^19397739631 is an apocalyptic number.

19397739631 is a deficient number, since it is larger than the sum of its proper divisors (1).

19397739631 is an equidigital number, since it uses as much as digits as its factorization.

19397739631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5786802, while the sum is 58.

The spelling of 19397739631 in words is "nineteen billion, three hundred ninety-seven million, seven hundred thirty-nine thousand, six hundred thirty-one".