31439208719 has 2 divisors, whose sum is σ = 31439208720. Its totient is φ = 31439208718.

The previous prime is 31439208677. The next prime is 31439208721. The reversal of 31439208719 is 91780293413.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31439208719 is a prime.

It is a super-2 number, since 2×31439208719² (a number of 22 digits) contains 22 as substring.

Together with 31439208721, 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 (31439208769) 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, 15719604359 + 15719604360.

It is an arithmetic number, because the mean of its divisors is an integer number (15719604360).

Almost surely, 2^31439208719 is an apocalyptic number.

31439208719 is a deficient number, since it is larger than the sum of its proper divisors (1).

31439208719 is an equidigital number, since it uses as much as digits as its factorization.

31439208719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 31439208719 in words is "thirty-one billion, four hundred thirty-nine million, two hundred eight thousand, seven hundred nineteen".