1256874977 has 2 divisors, whose sum is σ = 1256874978. Its totient is φ = 1256874976.

The previous prime is 1256874953. The next prime is 1256874979. The reversal of 1256874977 is 7794786521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106959441 + 149915536 = 33271^2 + 12244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256874977 - 2¹⁶ = 1256809441 is a prime.

Together with 1256874979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1256874979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628437488 + 628437489.

It is an arithmetic number, because the mean of its divisors is an integer number (628437489).

Almost surely, 2^1256874977 is an apocalyptic number.

It is an amenable number.

1256874977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256874977 is an equidigital number, since it uses as much as digits as its factorization.

1256874977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 56.

The square root of 1256874977 is about 35452.4325963678. The cubic root of 1256874977 is about 1079.1886272745.

The spelling of 1256874977 in words is "one billion, two hundred fifty-six million, eight hundred seventy-four thousand, nine hundred seventy-seven".