31638883613 has 4 divisors (see below), whose sum is σ = 32374671648. Its totient is φ = 30903095580.

The previous prime is 31638883589. The next prime is 31638883621.

It is a happy number.

31638883613 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 not a de Polignac number, because 31638883613 - 2¹⁶ = 31638818077 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 (31638883643) 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, 367893953 + ... + 367894038.

It is an arithmetic number, because the mean of its divisors is an integer number (8093667912).

Almost surely, 2^31638883613 is an apocalyptic number.

It is an amenable number.

31638883613 is a deficient number, since it is larger than the sum of its proper divisors (735788035).

31638883613 is an equidigital number, since it uses as much as digits as its factorization.

31638883613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735788034.

The product of its digits is 1492992, while the sum is 50.

The spelling of 31638883613 in words is "thirty-one billion, six hundred thirty-eight million, eight hundred eighty-three thousand, six hundred thirteen".