1296256517 has 8 divisors (see below), whose sum is σ = 1353179520. Its totient is φ = 1239380560.

The previous prime is 1296256499. The next prime is 1296256519. The reversal of 1296256517 is 7156526921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1296256517 - 2²⁴ = 1279479301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296256519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51959 + ... + 72747.

It is an arithmetic number, because the mean of its divisors is an integer number (169147440).

Almost surely, 2^1296256517 is an apocalyptic number.

It is an amenable number.

1296256517 is a deficient number, since it is larger than the sum of its proper divisors (56923003).

1296256517 is a wasteful number, since it uses less digits than its factorization.

1296256517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23523.

The product of its digits is 226800, while the sum is 44.

The square root of 1296256517 is about 36003.5625598357. The cubic root of 1296256517 is about 1090.3442834112.

The spelling of 1296256517 in words is "one billion, two hundred ninety-six million, two hundred fifty-six thousand, five hundred seventeen".