255617791 has 16 divisors (see below), whose sum is σ = 313367040. Its totient is φ = 205175520.

The previous prime is 255617777. The next prime is 255617801. The reversal of 255617791 is 197716552.

It is a de Polignac number, because none of the positive numbers 2^k-255617791 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 (255617711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35571 + ... + 42148.

It is an arithmetic number, because the mean of its divisors is an integer number (19585440).

Almost surely, 2^255617791 is an apocalyptic number.

255617791 is a deficient number, since it is larger than the sum of its proper divisors (57749249).

255617791 is a wasteful number, since it uses less digits than its factorization.

255617791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77766.

The product of its digits is 132300, while the sum is 43.

The square root of 255617791 is about 15988.0515072976. The cubic root of 255617791 is about 634.6442639310.

The spelling of 255617791 in words is "two hundred fifty-five million, six hundred seventeen thousand, seven hundred ninety-one".