250661 has 4 divisors (see below), whose sum is σ = 251712. Its totient is φ = 249612.

The previous prime is 250643. The next prime is 250673. The reversal of 250661 is 166052.

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 a de Polignac number, because none of the positive numbers 2^k-250661 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 (250681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26 + ... + 708.

It is an arithmetic number, because the mean of its divisors is an integer number (62928).

2²⁵⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

250661 is a deficient number, since it is larger than the sum of its proper divisors (1051).

250661 is an equidigital number, since it uses as much as digits as its factorization.

250661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 250661 is about 500.6605636557. The cubic root of 250661 is about 63.0515241553.

The spelling of 250661 in words is "two hundred fifty thousand, six hundred sixty-one".