63313581 has 4 divisors (see below), whose sum is σ = 84418112. Its totient is φ = 42209052.

The previous prime is 63313577. The next prime is 63313597. The reversal of 63313581 is 18531336.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 63313581 - 2² = 63313577 is a prime.

It is a super-2 number, since 2×63313581² = 8017219078087122, 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 (63313571) 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, 10552261 + ... + 10552266.

It is an arithmetic number, because the mean of its divisors is an integer number (21104528).

Almost surely, 2^63313581 is an apocalyptic number.

It is an amenable number.

63313581 is a deficient number, since it is larger than the sum of its proper divisors (21104531).

63313581 is a wasteful number, since it uses less digits than its factorization.

63313581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21104530.

The product of its digits is 6480, while the sum is 30.

The square root of 63313581 is about 7956.9831594644. The cubic root of 63313581 is about 398.5648172011.

The spelling of 63313581 in words is "sixty-three million, three hundred thirteen thousand, five hundred eighty-one".