252661 has 4 divisors (see below), whose sum is σ = 253792. Its totient is φ = 251532.

The previous prime is 252641. The next prime is 252667. The reversal of 252661 is 166252.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 252661 - 2⁷ = 252533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252667) 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, 105 + ... + 718.

It is an arithmetic number, because the mean of its divisors is an integer number (63448).

2²⁵²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

252661 is a deficient number, since it is larger than the sum of its proper divisors (1131).

252661 is an equidigital number, since it uses as much as digits as its factorization.

252661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

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

The square root of 252661 is about 502.6539565148. The cubic root of 252661 is about 63.2187741319.

The spelling of 252661 in words is "two hundred fifty-two thousand, six hundred sixty-one".