31504201613 has 8 divisors (see below), whose sum is σ = 31535746200. Its totient is φ = 31472676928.

The previous prime is 31504201609. The next prime is 31504201643. The reversal of 31504201613 is 31610240513.

It can be written as a sum of positive squares in 4 ways, for example, as 18499536169 + 13004665444 = 136013^2 + 114038^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31504201613 - 2² = 31504201609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31504201643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7009595 + ... + 7014087.

It is an arithmetic number, because the mean of its divisors is an integer number (3941968275).

Almost surely, 2^31504201613 is an apocalyptic number.

It is an amenable number.

31504201613 is a deficient number, since it is larger than the sum of its proper divisors (31544587).

31504201613 is a wasteful number, since it uses less digits than its factorization.

31504201613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9951.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 31504201613 in words is "thirty-one billion, five hundred four million, two hundred one thousand, six hundred thirteen".