253891 has 4 divisors (see below), whose sum is σ = 276984. Its totient is φ = 230800.

The previous prime is 253879. The next prime is 253901. The reversal of 253891 is 198352.

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 253891 - 2⁷ = 253763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11530 + ... + 11551.

It is an arithmetic number, because the mean of its divisors is an integer number (69246).

2²⁵³⁸⁹¹ is an apocalyptic number.

253891 is a deficient number, since it is larger than the sum of its proper divisors (23093).

253891 is a wasteful number, since it uses less digits than its factorization.

253891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23092.

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

The square root of 253891 is about 503.8759768038. The cubic root of 253891 is about 63.3211949652.

It can be divided in two parts, 25 and 3891, that added together give a triangular number (3916 = T₈₈).

The spelling of 253891 in words is "two hundred fifty-three thousand, eight hundred ninety-one".