31670721313 has 16 divisors (see below), whose sum is σ = 39495095424. Its totient is φ = 24672533760.

The previous prime is 31670721283. The next prime is 31670721323. The reversal of 31670721313 is 31312707613.

It is not a de Polignac number, because 31670721313 - 2¹⁷ = 31670590241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31670721323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286531 + ... + 381367.

It is an arithmetic number, because the mean of its divisors is an integer number (2468443464).

Almost surely, 2^31670721313 is an apocalyptic number.

It is an amenable number.

31670721313 is a deficient number, since it is larger than the sum of its proper divisors (7824374111).

31670721313 is a wasteful number, since it uses less digits than its factorization.

31670721313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99192.

The product of its (nonzero) digits is 15876, while the sum is 34.

The spelling of 31670721313 in words is "thirty-one billion, six hundred seventy million, seven hundred twenty-one thousand, three hundred thirteen".