31887113317 has 2 divisors, whose sum is σ = 31887113318. Its totient is φ = 31887113316.

The previous prime is 31887113309. The next prime is 31887113407. The reversal of 31887113317 is 71331178813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29628392641 + 2258720676 = 172129^2 + 47526^2 .

It is a cyclic number.

It is not a de Polignac number, because 31887113317 - 2³ = 31887113309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31887113117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15943556658 + 15943556659.

It is an arithmetic number, because the mean of its divisors is an integer number (15943556659).

Almost surely, 2^31887113317 is an apocalyptic number.

It is an amenable number.

31887113317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31887113317 is an equidigital number, since it uses as much as digits as its factorization.

31887113317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The spelling of 31887113317 in words is "thirty-one billion, eight hundred eighty-seven million, one hundred thirteen thousand, three hundred seventeen".