31609979719 has 2 divisors, whose sum is σ = 31609979720. Its totient is φ = 31609979718.

The previous prime is 31609979699. The next prime is 31609979743. The reversal of 31609979719 is 91797990613.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31609979719 - 2¹¹ = 31609977671 is a prime.

It is a super-2 number, since 2×31609979719² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31609974719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804989859 + 15804989860.

It is an arithmetic number, because the mean of its divisors is an integer number (15804989860).

Almost surely, 2^31609979719 is an apocalyptic number.

31609979719 is a deficient number, since it is larger than the sum of its proper divisors (1).

31609979719 is an equidigital number, since it uses as much as digits as its factorization.

31609979719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5786802, while the sum is 61.

The spelling of 31609979719 in words is "thirty-one billion, six hundred nine million, nine hundred seventy-nine thousand, seven hundred nineteen".