1256340259 has 2 divisors, whose sum is σ = 1256340260. Its totient is φ = 1256340258.

The previous prime is 1256340229. The next prime is 1256340269. The reversal of 1256340259 is 9520436521.

It is a strong prime.

It is an emirp because it is prime and its reverse (9520436521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256340259 - 2¹¹ = 1256338211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256340229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628170129 + 628170130.

It is an arithmetic number, because the mean of its divisors is an integer number (628170130).

Almost surely, 2^1256340259 is an apocalyptic number.

1256340259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256340259 is an equidigital number, since it uses as much as digits as its factorization.

1256340259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1256340259 is about 35444.8904498237. The cubic root of 1256340259 is about 1079.0355642018.

The spelling of 1256340259 in words is "one billion, two hundred fifty-six million, three hundred forty thousand, two hundred fifty-nine".