250981 has 4 divisors (see below), whose sum is σ = 252000. Its totient is φ = 249964.

The previous prime is 250979. The next prime is 250993. The reversal of 250981 is 189052.

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 250981 - 2¹ = 250979 is a prime.

It is a super-2 number, since 2×250981² = 125982924722, 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 (250951) 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, 120 + ... + 718.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2²⁵⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

250981 is a deficient number, since it is larger than the sum of its proper divisors (1019).

250981 is an equidigital number, since it uses as much as digits as its factorization.

250981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 250981 is about 500.9800395225. The cubic root of 250981 is about 63.0783437881.

The spelling of 250981 in words is "two hundred fifty thousand, nine hundred eighty-one".