31504510013 has 4 divisors (see below), whose sum is σ = 31509400128. Its totient is φ = 31499619900.

The previous prime is 31504509901. The next prime is 31504510019. The reversal of 31504510013 is 31001540513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31001540513 = 19 ⋅1631660027.

It is a cyclic number.

It is not a de Polignac number, because 31504510013 - 2²² = 31500315709 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 (31504510019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2435381 + ... + 2448282.

It is an arithmetic number, because the mean of its divisors is an integer number (7877350032).

Almost surely, 2^31504510013 is an apocalyptic number.

It is an amenable number.

31504510013 is a deficient number, since it is larger than the sum of its proper divisors (4890115).

31504510013 is an equidigital number, since it uses as much as digits as its factorization.

31504510013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4890114.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 31504510013 in words is "thirty-one billion, five hundred four million, five hundred ten thousand, thirteen".