252581 has 4 divisors (see below), whose sum is σ = 288672. Its totient is φ = 216492.

The previous prime is 252559. The next prime is 252583. The reversal of 252581 is 185252.

252581 = T₈₈ + T₈₉ + ... + T₁₂₉.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252581 is a prime.

It is a super-2 number, since 2×252581² = 127594323122, which contains 22 as substring.

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 (252583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18035 + ... + 18048.

It is an arithmetic number, because the mean of its divisors is an integer number (72168).

2²⁵²⁵⁸¹ is an apocalyptic number.

It is an amenable number.

252581 is a deficient number, since it is larger than the sum of its proper divisors (36091).

252581 is an equidigital number, since it uses as much as digits as its factorization.

252581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36090.

The product of its digits is 800, while the sum is 23.

The square root of 252581 is about 502.5743726057. The cubic root of 252581 is about 63.2121011118.

The spelling of 252581 in words is "two hundred fifty-two thousand, five hundred eighty-one".