63395981 has 16 divisors (see below), whose sum is σ = 73059840. Its totient is φ = 54444720.

The previous prime is 63395977. The next prime is 63395993. The reversal of 63395981 is 18959336.

It is not a de Polignac number, because 63395981 - 2² = 63395977 is a prime.

It is a super-2 number, since 2×63395981² = 8038100813904722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63395921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19490 + ... + 22508.

It is an arithmetic number, because the mean of its divisors is an integer number (4566240).

Almost surely, 2^63395981 is an apocalyptic number.

It is an amenable number.

63395981 is a deficient number, since it is larger than the sum of its proper divisors (9663859).

63395981 is a wasteful number, since it uses less digits than its factorization.

63395981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136.

The product of its digits is 174960, while the sum is 44.

The square root of 63395981 is about 7962.1593176726. The cubic root of 63395981 is about 398.7376474392.

The spelling of 63395981 in words is "sixty-three million, three hundred ninety-five thousand, nine hundred eighty-one".