1256050405317 has 4 divisors (see below), whose sum is σ = 1674733873760. Its totient is φ = 837366936876.

The previous prime is 1256050405297. The next prime is 1256050405331. The reversal of 1256050405317 is 7135040506521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1256050405317 - 2¹⁰ = 1256050404293 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 (1256050405397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209341734217 + ... + 209341734222.

It is an arithmetic number, because the mean of its divisors is an integer number (418683468440).

Almost surely, 2^{1256050405317} is an apocalyptic number.

It is an amenable number.

1256050405317 is a deficient number, since it is larger than the sum of its proper divisors (418683468443).

1256050405317 is an equidigital number, since it uses as much as digits as its factorization.

1256050405317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418683468442.

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 1256050405317 in words is "one trillion, two hundred fifty-six billion, fifty million, four hundred five thousand, three hundred seventeen".