31872427813 has 4 divisors (see below), whose sum is σ = 33258185568. Its totient is φ = 30486670060.

The previous prime is 31872427753. The next prime is 31872427871.

31872427813 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31872427813 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 (31872487813) 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, 692878843 + ... + 692878888.

It is an arithmetic number, because the mean of its divisors is an integer number (8314546392).

Almost surely, 2^31872427813 is an apocalyptic number.

It is an amenable number.

31872427813 is a deficient number, since it is larger than the sum of its proper divisors (1385757755).

31872427813 is a wasteful number, since it uses less digits than its factorization.

31872427813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385757754.

The product of its digits is 451584, while the sum is 46.

The spelling of 31872427813 in words is "thirty-one billion, eight hundred seventy-two million, four hundred twenty-seven thousand, eight hundred thirteen".