1256928551 has 2 divisors, whose sum is σ = 1256928552. Its totient is φ = 1256928550.

The previous prime is 1256928539. The next prime is 1256928583. The reversal of 1256928551 is 1558296521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256928551 is a prime.

It is a super-3 number, since 3×1256928551³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256924551) 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, 628464275 + 628464276.

It is an arithmetic number, because the mean of its divisors is an integer number (628464276).

Almost surely, 2^1256928551 is an apocalyptic number.

1256928551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256928551 is an equidigital number, since it uses as much as digits as its factorization.

1256928551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 44.

The square root of 1256928551 is about 35453.1881641130. The cubic root of 1256928551 is about 1079.2039604437.

The spelling of 1256928551 in words is "one billion, two hundred fifty-six million, nine hundred twenty-eight thousand, five hundred fifty-one".