257261351 has 2 divisors, whose sum is σ = 257261352. Its totient is φ = 257261350.

The previous prime is 257261341. The next prime is 257261393. The reversal of 257261351 is 153162752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257261351 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 (257261341) 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, 128630675 + 128630676.

It is an arithmetic number, because the mean of its divisors is an integer number (128630676).

Almost surely, 2^257261351 is an apocalyptic number.

257261351 is a deficient number, since it is larger than the sum of its proper divisors (1).

257261351 is an equidigital number, since it uses as much as digits as its factorization.

257261351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 32.

The square root of 257261351 is about 16039.3687843381. The cubic root of 257261351 is about 636.0015616103.

The spelling of 257261351 in words is "two hundred fifty-seven million, two hundred sixty-one thousand, three hundred fifty-one".