253981 has 8 divisors (see below), whose sum is σ = 312704. Its totient is φ = 200880.

The previous prime is 253969. The next prime is 253987. The reversal of 253981 is 189352.

253981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253981 - 2⁵ = 253949 is a prime.

It is a super-2 number, since 2×253981² = 129012696722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (39088).

2²⁵³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

253981 is a deficient number, since it is larger than the sum of its proper divisors (58723).

253981 is a wasteful number, since it uses less digits than its factorization.

253981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811.

The product of its digits is 2160, while the sum is 28.

The square root of 253981 is about 503.9652765816. The cubic root of 253981 is about 63.3286761734.

The spelling of 253981 in words is "two hundred fifty-three thousand, nine hundred eighty-one".