1311255259 has 2 divisors, whose sum is σ = 1311255260. Its totient is φ = 1311255258.

The previous prime is 1311255233. The next prime is 1311255347. The reversal of 1311255259 is 9525521131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311255259 - 2¹⁷ = 1311124187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311255859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655627629 + 655627630.

It is an arithmetic number, because the mean of its divisors is an integer number (655627630).

Almost surely, 2^1311255259 is an apocalyptic number.

1311255259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311255259 is an equidigital number, since it uses as much as digits as its factorization.

1311255259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 34.

The square root of 1311255259 is about 36211.2587326097. The cubic root of 1311255259 is about 1094.5335569558.

The spelling of 1311255259 in words is "one billion, three hundred eleven million, two hundred fifty-five thousand, two hundred fifty-nine".