251488379 has 2 divisors, whose sum is σ = 251488380. Its totient is φ = 251488378.

The previous prime is 251488343. The next prime is 251488403. The reversal of 251488379 is 973884152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251488379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251988379) 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, 125744189 + 125744190.

It is an arithmetic number, because the mean of its divisors is an integer number (125744190).

Almost surely, 2^251488379 is an apocalyptic number.

251488379 is a deficient number, since it is larger than the sum of its proper divisors (1).

251488379 is an equidigital number, since it uses as much as digits as its factorization.

251488379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 251488379 is about 15858.3851321627. The cubic root of 251488379 is about 631.2082121931.

The spelling of 251488379 in words is "two hundred fifty-one million, four hundred eighty-eight thousand, three hundred seventy-nine".