53981663 has 4 divisors (see below), whose sum is σ = 54129120. Its totient is φ = 53834208.

The previous prime is 53981651. The next prime is 53981687. The reversal of 53981663 is 36618935.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53981663 - 2⁸ = 53981407 is a prime.

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 53981663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53981693) 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, 73178 + ... + 73911.

It is an arithmetic number, because the mean of its divisors is an integer number (13532280).

Almost surely, 2^53981663 is an apocalyptic number.

53981663 is a deficient number, since it is larger than the sum of its proper divisors (147457).

53981663 is a wasteful number, since it uses less digits than its factorization.

53981663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147456.

The product of its digits is 116640, while the sum is 41.

The square root of 53981663 is about 7347.2214475950. The cubic root of 53981663 is about 377.9335264724.

The spelling of 53981663 in words is "fifty-three million, nine hundred eighty-one thousand, six hundred sixty-three".