63931989 has 8 divisors (see below), whose sum is σ = 92992032. Its totient is φ = 38746640.

The previous prime is 63931969. The next prime is 63932027. The reversal of 63931989 is 98913936.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63931989 - 2⁸ = 63931733 is a prime.

It is a super-2 number, since 2×63931989² = 8174598434992242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63931909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968634 + ... + 968699.

It is an arithmetic number, because the mean of its divisors is an integer number (11624004).

Almost surely, 2^63931989 is an apocalyptic number.

It is an amenable number.

63931989 is a deficient number, since it is larger than the sum of its proper divisors (29060043).

63931989 is a wasteful number, since it uses less digits than its factorization.

63931989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937347.

The product of its digits is 314928, while the sum is 48.

The square root of 63931989 is about 7995.7481826281. The cubic root of 63931989 is about 399.8582601972.

The spelling of 63931989 in words is "sixty-three million, nine hundred thirty-one thousand, nine hundred eighty-nine".