253381 has 2 divisors, whose sum is σ = 253382. Its totient is φ = 253380.

The previous prime is 253369. The next prime is 253387. The reversal of 253381 is 183352.

It is the 206-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188356 + 65025 = 434^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 253381 - 2⁵ = 253349 is a prime.

It is a super-2 number, since 2×253381² = 128403862322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126690 + 126691.

It is an arithmetic number, because the mean of its divisors is an integer number (126691).

2²⁵³³⁸¹ is an apocalyptic number.

It is an amenable number.

253381 is a deficient number, since it is larger than the sum of its proper divisors (1).

253381 is an equidigital number, since it uses as much as digits as its factorization.

253381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 253381 is about 503.3696454893. The cubic root of 253381 is about 63.2787680224.

The spelling of 253381 in words is "two hundred fifty-three thousand, three hundred eighty-one".