251087 has 2 divisors, whose sum is σ = 251088. Its totient is φ = 251086.

The previous prime is 251081. The next prime is 251099. The reversal of 251087 is 780152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251087 - 2⁴ = 251071 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 251087.

It is not a weakly prime, because it can be changed into another prime (251081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125543 + 125544.

It is an arithmetic number, because the mean of its divisors is an integer number (125544).

2²⁵¹⁰⁸⁷ is an apocalyptic number.

251087 is a deficient number, since it is larger than the sum of its proper divisors (1).

251087 is an equidigital number, since it uses as much as digits as its factorization.

251087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 251087 is about 501.0858209928. The cubic root of 251087 is about 63.0872227648.

The spelling of 251087 in words is "two hundred fifty-one thousand, eighty-seven".