63579981 has 12 divisors (see below), whose sum is σ = 88621568. Its totient is φ = 40542744.

The previous prime is 63579979. The next prime is 63579991. The reversal of 63579981 is 18997536.

It is not a de Polignac number, because 63579981 - 2¹ = 63579979 is a prime.

It is a super-2 number, since 2×63579981² = 8084827967920722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63579981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63579961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18445 + ... + 21618.

Almost surely, 2^63579981 is an apocalyptic number.

It is an amenable number.

63579981 is a deficient number, since it is larger than the sum of its proper divisors (25041587).

63579981 is a wasteful number, since it uses less digits than its factorization.

63579981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40112 (or 40089 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 63579981 is about 7973.7056002840. The cubic root of 63579981 is about 399.1230391710.

The spelling of 63579981 in words is "sixty-three million, five hundred seventy-nine thousand, nine hundred eighty-one".