1256795117 has 2 divisors, whose sum is σ = 1256795118. Its totient is φ = 1256795116.

The previous prime is 1256795107. The next prime is 1256795131. The reversal of 1256795117 is 7115976521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 964350916 + 292444201 = 31054^2 + 17101^2 .

It is an emirp because it is prime and its reverse (7115976521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256795117 - 2¹⁸ = 1256532973 is a prime.

It is a super-4 number, since 4×1256795117⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256795107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628397558 + 628397559.

It is an arithmetic number, because the mean of its divisors is an integer number (628397559).

Almost surely, 2^1256795117 is an apocalyptic number.

It is an amenable number.

1256795117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256795117 is an equidigital number, since it uses as much as digits as its factorization.

1256795117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 44.

The square root of 1256795117 is about 35451.3062805872. The cubic root of 1256795117 is about 1079.1657701007.

The spelling of 1256795117 in words is "one billion, two hundred fifty-six million, seven hundred ninety-five thousand, one hundred seventeen".