53981 has 4 divisors (see below), whose sum is σ = 56352. Its totient is φ = 51612.

The previous prime is 53959. The next prime is 53987. The reversal of 53981 is 18935.

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 53981 - 2⁶ = 53917 is a prime.

It is a super-2 number, since 2×53981² = 5827896722, 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 53981.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 53981.

It is not an unprimeable number, because it can be changed into a prime (53987) 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, 1151 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (14088).

2⁵³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

53981 is a deficient number, since it is larger than the sum of its proper divisors (2371).

53981 is a wasteful number, since it uses less digits than its factorization.

53981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its digits is 1080, while the sum is 26.

The square root of 53981 is about 232.3381156849. The cubic root of 53981 is about 37.7931979213.

The spelling of 53981 in words is "fifty-three thousand, nine hundred eighty-one".