63531081 has 16 divisors (see below), whose sum is σ = 96310720. Its totient is φ = 41368320.

The previous prime is 63531077. The next prime is 63531101. The reversal of 63531081 is 18013536.

It is not a de Polignac number, because 63531081 - 2² = 63531077 is a prime.

It is a super-2 number, since 2×63531081² = 8072396506057122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63531001) 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, 26200 + ... + 28521.

It is an arithmetic number, because the mean of its divisors is an integer number (6019420).

Almost surely, 2^63531081 is an apocalyptic number.

It is an amenable number.

63531081 is a deficient number, since it is larger than the sum of its proper divisors (32779639).

63531081 is a wasteful number, since it uses less digits than its factorization.

63531081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54773 (or 54767 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 63531081 is about 7970.6386820631. The cubic root of 63531081 is about 399.0206897519.

The spelling of 63531081 in words is "sixty-three million, five hundred thirty-one thousand, eighty-one".