1256413289 has 2 divisors, whose sum is σ = 1256413290. Its totient is φ = 1256413288.

The previous prime is 1256413241. The next prime is 1256413297. The reversal of 1256413289 is 9823146521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204645264 + 51768025 = 34708^2 + 7195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256413289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256413219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628206644 + 628206645.

It is an arithmetic number, because the mean of its divisors is an integer number (628206645).

Almost surely, 2^1256413289 is an apocalyptic number.

It is an amenable number.

1256413289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256413289 is an equidigital number, since it uses as much as digits as its factorization.

1256413289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 1256413289 is about 35445.9206256517. The cubic root of 1256413289 is about 1079.0564716059.

The spelling of 1256413289 in words is "one billion, two hundred fifty-six million, four hundred thirteen thousand, two hundred eighty-nine".