1256656259 has 2 divisors, whose sum is σ = 1256656260. Its totient is φ = 1256656258.

The previous prime is 1256656253. The next prime is 1256656307. The reversal of 1256656259 is 9526566521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256656259 - 2¹⁶ = 1256590723 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256656253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628328129 + 628328130.

It is an arithmetic number, because the mean of its divisors is an integer number (628328130).

Almost surely, 2^1256656259 is an apocalyptic number.

1256656259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256656259 is an equidigital number, since it uses as much as digits as its factorization.

1256656259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 47.

The square root of 1256656259 is about 35449.3477937183. The cubic root of 1256656259 is about 1079.1260244764.

The spelling of 1256656259 in words is "one billion, two hundred fifty-six million, six hundred fifty-six thousand, two hundred fifty-nine".