632985891 has 4 divisors (see below), whose sum is σ = 843981192. Its totient is φ = 421990592.

The previous prime is 632985883. The next prime is 632985923. The reversal of 632985891 is 198589236.

It is a happy number.

632985891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 632985891 - 2³ = 632985883 is a prime.

It is a super-2 number, since 2×632985891² = 801342276410127762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (632985091) 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, 105497646 + ... + 105497651.

It is an arithmetic number, because the mean of its divisors is an integer number (210995298).

Almost surely, 2^632985891 is an apocalyptic number.

632985891 is a deficient number, since it is larger than the sum of its proper divisors (210995301).

632985891 is a wasteful number, since it uses less digits than its factorization.

632985891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210995300.

The product of its digits is 933120, while the sum is 51.

The square root of 632985891 is about 25159.2108580536. The cubic root of 632985891 is about 858.6140878495.

The spelling of 632985891 in words is "six hundred thirty-two million, nine hundred eighty-five thousand, eight hundred ninety-one".