31384606521 has 16 divisors (see below), whose sum is σ = 42672051968. Its totient is φ = 20513077200.

The previous prime is 31384606501. The next prime is 31384606531. The reversal of 31384606521 is 12560648313.

It is not a de Polignac number, because 31384606521 - 2¹⁸ = 31384344377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31384606521.

It is not an unprimeable number, because it can be changed into a prime (31384606501) 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, 327595 + ... + 412416.

It is an arithmetic number, because the mean of its divisors is an integer number (2667003248).

Almost surely, 2^31384606521 is an apocalyptic number.

It is an amenable number.

31384606521 is a deficient number, since it is larger than the sum of its proper divisors (11287445447).

31384606521 is a wasteful number, since it uses less digits than its factorization.

31384606521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740292.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 31384606521 in words is "thirty-one billion, three hundred eighty-four million, six hundred six thousand, five hundred twenty-one".