1256133317 has 2 divisors, whose sum is σ = 1256133318. Its totient is φ = 1256133316.

The previous prime is 1256133311. The next prime is 1256133323. The reversal of 1256133317 is 7133316521.

It is a balanced prime because it is at equal distance from previous prime (1256133311) and next prime (1256133323).

It can be written as a sum of positive squares in only one way, i.e., 779191396 + 476941921 = 27914^2 + 21839^2 .

It is an emirp because it is prime and its reverse (7133316521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256133317 - 2⁶ = 1256133253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256133311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628066658 + 628066659.

It is an arithmetic number, because the mean of its divisors is an integer number (628066659).

Almost surely, 2^1256133317 is an apocalyptic number.

It is an amenable number.

1256133317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256133317 is an equidigital number, since it uses as much as digits as its factorization.

1256133317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 1256133317 is about 35441.9711218211. The cubic root of 1256133317 is about 1078.9763153803.

Adding to 1256133317 its reverse (7133316521), we get a palindrome (8389449838).

The spelling of 1256133317 in words is "one billion, two hundred fifty-six million, one hundred thirty-three thousand, three hundred seventeen".