251485279 has 2 divisors, whose sum is σ = 251485280. Its totient is φ = 251485278.

The previous prime is 251485277. The next prime is 251485291. The reversal of 251485279 is 972584152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251485279 - 2¹ = 251485277 is a prime.

Together with 251485277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251485277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125742639 + 125742640.

It is an arithmetic number, because the mean of its divisors is an integer number (125742640).

Almost surely, 2^251485279 is an apocalyptic number.

251485279 is a deficient number, since it is larger than the sum of its proper divisors (1).

251485279 is an equidigital number, since it uses as much as digits as its factorization.

251485279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 251485279 is about 15858.2873917709. The cubic root of 251485279 is about 631.2056186292.

The spelling of 251485279 in words is "two hundred fifty-one million, four hundred eighty-five thousand, two hundred seventy-nine".