1256492351 has 2 divisors, whose sum is σ = 1256492352. Its totient is φ = 1256492350.

The previous prime is 1256492327. The next prime is 1256492353. The reversal of 1256492351 is 1532946521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256492351 is a prime.

Together with 1256492353, 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 (1256492353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628246175 + 628246176.

It is an arithmetic number, because the mean of its divisors is an integer number (628246176).

Almost surely, 2^1256492351 is an apocalyptic number.

1256492351 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256492351 is an equidigital number, since it uses as much as digits as its factorization.

1256492351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The square root of 1256492351 is about 35447.0358563308. The cubic root of 1256492351 is about 1079.0791049687.

The spelling of 1256492351 in words is "one billion, two hundred fifty-six million, four hundred ninety-two thousand, three hundred fifty-one".