53981287 has 4 divisors (see below), whose sum is σ = 54019456. Its totient is φ = 53943120.

The previous prime is 53981251. The next prime is 53981309. The reversal of 53981287 is 78218935.

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 53981287 - 2⁷ = 53981159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53981687) 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, 16878 + ... + 19819.

It is an arithmetic number, because the mean of its divisors is an integer number (13504864).

Almost surely, 2^53981287 is an apocalyptic number.

53981287 is a deficient number, since it is larger than the sum of its proper divisors (38169).

53981287 is a wasteful number, since it uses less digits than its factorization.

53981287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38168.

The product of its digits is 120960, while the sum is 43.

The square root of 53981287 is about 7347.1958596460. The cubic root of 53981287 is about 377.9326489934.

The spelling of 53981287 in words is "fifty-three million, nine hundred eighty-one thousand, two hundred eighty-seven".