31624242613 has 4 divisors (see below), whose sum is σ = 31937354028. Its totient is φ = 31311131200.

The previous prime is 31624242553. The next prime is 31624242649.

31624242613 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22391531044 + 9232711569 = 149638^2 + 96087^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31624242613 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 (31624242413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156555556 + ... + 156555757.

It is an arithmetic number, because the mean of its divisors is an integer number (7984338507).

Almost surely, 2^31624242613 is an apocalyptic number.

It is an amenable number.

31624242613 is a deficient number, since it is larger than the sum of its proper divisors (313111415).

31624242613 is a wasteful number, since it uses less digits than its factorization.

31624242613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313111414.

The product of its digits is 41472, while the sum is 34.

The spelling of 31624242613 in words is "thirty-one billion, six hundred twenty-four million, two hundred forty-two thousand, six hundred thirteen".