63618631 has 4 divisors (see below), whose sum is σ = 66967000. Its totient is φ = 60270264.

The previous prime is 63618623. The next prime is 63618637. The reversal of 63618631 is 13681636.

It is a happy number.

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 63618631 - 2³ = 63618623 is a prime.

It is a super-2 number, since 2×63618631² = 8094660420628322, 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 (63618637) 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, 1674156 + ... + 1674193.

It is an arithmetic number, because the mean of its divisors is an integer number (16741750).

Almost surely, 2^63618631 is an apocalyptic number.

63618631 is a deficient number, since it is larger than the sum of its proper divisors (3348369).

63618631 is a wasteful number, since it uses less digits than its factorization.

63618631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348368.

The product of its digits is 15552, while the sum is 34.

The square root of 63618631 is about 7976.1288229316. The cubic root of 63618631 is about 399.2038978546.

The spelling of 63618631 in words is "sixty-three million, six hundred eighteen thousand, six hundred thirty-one".