31836881613 has 4 divisors (see below), whose sum is σ = 42449175488. Its totient is φ = 21224587740.

The previous prime is 31836881599. The next prime is 31836881623. The reversal of 31836881613 is 31618863813.

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 not a de Polignac number, because 31836881613 - 2⁵ = 31836881581 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 (31836881623) 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, 5306146933 + ... + 5306146938.

It is an arithmetic number, because the mean of its divisors is an integer number (10612293872).

Almost surely, 2^31836881613 is an apocalyptic number.

It is an amenable number.

31836881613 is a deficient number, since it is larger than the sum of its proper divisors (10612293875).

31836881613 is a wasteful number, since it uses less digits than its factorization.

31836881613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10612293874.

The product of its digits is 497664, while the sum is 48.

The spelling of 31836881613 in words is "thirty-one billion, eight hundred thirty-six million, eight hundred eighty-one thousand, six hundred thirteen".