63355981 has 16 divisors (see below), whose sum is σ = 71084160. Its totient is φ = 56064960.

The previous prime is 63355979. The next prime is 63355997. The reversal of 63355981 is 18955336.

It is a cyclic number.

It is not a de Polignac number, because 63355981 - 2¹ = 63355979 is a prime.

It is a super-2 number, since 2×63355981² = 8027960656944722, 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 (63355681) 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, 60936 + ... + 61966.

It is an arithmetic number, because the mean of its divisors is an integer number (4442760).

Almost surely, 2^63355981 is an apocalyptic number.

It is an amenable number.

63355981 is a deficient number, since it is larger than the sum of its proper divisors (7728179).

63355981 is a wasteful number, since it uses less digits than its factorization.

63355981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 97200, while the sum is 40.

The square root of 63355981 is about 7959.6470399133. The cubic root of 63355981 is about 398.6537679814.

The spelling of 63355981 in words is "sixty-three million, three hundred fifty-five thousand, nine hundred eighty-one".