31587278713 has 2 divisors, whose sum is σ = 31587278714. Its totient is φ = 31587278712.

The previous prime is 31587278693. The next prime is 31587278717. The reversal of 31587278713 is 31787278513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31376099689 + 211179024 = 177133^2 + 14532^2 .

It is an emirp because it is prime and its reverse (31787278513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31587278713 is a prime.

It is not a weakly prime, because it can be changed into another prime (31587278717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15793639356 + 15793639357.

It is an arithmetic number, because the mean of its divisors is an integer number (15793639357).

Almost surely, 2^31587278713 is an apocalyptic number.

It is an amenable number.

31587278713 is a deficient number, since it is larger than the sum of its proper divisors (1).

31587278713 is an equidigital number, since it uses as much as digits as its factorization.

31587278713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 52.

The spelling of 31587278713 in words is "thirty-one billion, five hundred eighty-seven million, two hundred seventy-eight thousand, seven hundred thirteen".