31439208677 has 2 divisors, whose sum is σ = 31439208678. Its totient is φ = 31439208676.

The previous prime is 31439208673. The next prime is 31439208719. The reversal of 31439208677 is 77680293413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31439190721 + 17956 = 177311^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 31439208677 - 2² = 31439208673 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31439208673) 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, 15719604338 + 15719604339.

It is an arithmetic number, because the mean of its divisors is an integer number (15719604339).

Almost surely, 2^31439208677 is an apocalyptic number.

It is an amenable number.

31439208677 is a deficient number, since it is larger than the sum of its proper divisors (1).

31439208677 is an equidigital number, since it uses as much as digits as its factorization.

31439208677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 31439208677 in words is "thirty-one billion, four hundred thirty-nine million, two hundred eight thousand, six hundred seventy-seven".