1256374397 has 2 divisors, whose sum is σ = 1256374398. Its totient is φ = 1256374396.

The previous prime is 1256374363. The next prime is 1256374429. The reversal of 1256374397 is 7934736521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767345401 + 489028996 = 27701^2 + 22114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256374397 - 2²⁰ = 1255325821 is a prime.

It is a super-2 number, since 2×1256374397² = 3156953250874227218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256374597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628187198 + 628187199.

It is an arithmetic number, because the mean of its divisors is an integer number (628187199).

Almost surely, 2^1256374397 is an apocalyptic number.

It is an amenable number.

1256374397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256374397 is an equidigital number, since it uses as much as digits as its factorization.

1256374397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 47.

The square root of 1256374397 is about 35445.3720110256. The cubic root of 1256374397 is about 1079.0453375049.

The spelling of 1256374397 in words is "one billion, two hundred fifty-six million, three hundred seventy-four thousand, three hundred ninety-seven".