252381 has 4 divisors (see below), whose sum is σ = 336512. Its totient is φ = 168252.

The previous prime is 252359. The next prime is 252383. The reversal of 252381 is 183252.

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 252381 - 2⁷ = 252253 is a prime.

It is a super-2 number, since 2×252381² = 127392338322, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252383) 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, 42061 + ... + 42066.

It is an arithmetic number, because the mean of its divisors is an integer number (84128).

2²⁵²³⁸¹ is an apocalyptic number.

It is an amenable number.

252381 is a deficient number, since it is larger than the sum of its proper divisors (84131).

252381 is an equidigital number, since it uses as much as digits as its factorization.

252381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84130.

The product of its digits is 480, while the sum is 21.

The square root of 252381 is about 502.3753576759. The cubic root of 252381 is about 63.1954123947.

The spelling of 252381 in words is "two hundred fifty-two thousand, three hundred eighty-one".