251879 has 2 divisors, whose sum is σ = 251880. Its totient is φ = 251878.

The previous prime is 251861. The next prime is 251887. The reversal of 251879 is 978152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251879 - 2⁸ = 251623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125939 + 125940.

It is an arithmetic number, because the mean of its divisors is an integer number (125940).

2²⁵¹⁸⁷⁹ is an apocalyptic number.

251879 is a deficient number, since it is larger than the sum of its proper divisors (1).

251879 is an equidigital number, since it uses as much as digits as its factorization.

251879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 251879 is about 501.8754825651. The cubic root of 251879 is about 63.1534848407.

The spelling of 251879 in words is "two hundred fifty-one thousand, eight hundred seventy-nine".