251442479 has 2 divisors, whose sum is σ = 251442480. Its totient is φ = 251442478.

The previous prime is 251442449. The next prime is 251442481. The reversal of 251442479 is 974244152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251442479 is a prime.

Together with 251442481, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251442419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125721239 + 125721240.

It is an arithmetic number, because the mean of its divisors is an integer number (125721240).

Almost surely, 2^251442479 is an apocalyptic number.

251442479 is a deficient number, since it is larger than the sum of its proper divisors (1).

251442479 is an equidigital number, since it uses as much as digits as its factorization.

251442479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 38.

The square root of 251442479 is about 15856.9378822016. The cubic root of 251442479 is about 631.1698085369.

The spelling of 251442479 in words is "two hundred fifty-one million, four hundred forty-two thousand, four hundred seventy-nine".