108021631 has 4 divisors (see below), whose sum is σ = 113707000. Its totient is φ = 102336264.

The previous prime is 108021619. The next prime is 108021637. The reversal of 108021631 is 136120801.

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

It is a cyclic number.

It is not a de Polignac number, because 108021631 - 2⁷ = 108021503 is a prime.

It is a super-2 number, since 2×108021631² = 23337345527800322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108021637) 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, 2842656 + ... + 2842693.

It is an arithmetic number, because the mean of its divisors is an integer number (28426750).

Almost surely, 2^108021631 is an apocalyptic number.

108021631 is a deficient number, since it is larger than the sum of its proper divisors (5685369).

108021631 is an equidigital number, since it uses as much as digits as its factorization.

108021631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5685368.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 108021631 is about 10393.3455152804. The cubic root of 108021631 is about 476.2521070534.

The spelling of 108021631 in words is "one hundred eight million, twenty-one thousand, six hundred thirty-one".