63897531 has 8 divisors (see below), whose sum is σ = 86640960. Its totient is φ = 41876232.

The previous prime is 63897523. The next prime is 63897539. The reversal of 63897531 is 13579836.

It is an interprime number because it is at equal distance from previous prime (63897523) and next prime (63897539).

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

It is not a de Polignac number, because 63897531 - 2³ = 63897523 is a prime.

It is a super-2 number, since 2×63897531² = 8165788935791922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63897539) 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, 180325 + ... + 180678.

It is an arithmetic number, because the mean of its divisors is an integer number (10830120).

Almost surely, 2^63897531 is an apocalyptic number.

63897531 is a deficient number, since it is larger than the sum of its proper divisors (22743429).

63897531 is a wasteful number, since it uses less digits than its factorization.

63897531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361065.

The product of its digits is 136080, while the sum is 42.

The square root of 63897531 is about 7993.5931219946. The cubic root of 63897531 is about 399.7864088841.

The spelling of 63897531 in words is "sixty-three million, eight hundred ninety-seven thousand, five hundred thirty-one".