255571691 has 8 divisors (see below), whose sum is σ = 265644624. Its totient is φ = 245665440.

The previous prime is 255571669. The next prime is 255571697. The reversal of 255571691 is 196175552.

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 255571691 - 2¹⁸ = 255309547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255571697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38540 + ... + 44681.

It is an arithmetic number, because the mean of its divisors is an integer number (33205578).

Almost surely, 2^255571691 is an apocalyptic number.

255571691 is a deficient number, since it is larger than the sum of its proper divisors (10072933).

255571691 is an equidigital number, since it uses as much as digits as its factorization.

255571691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83341.

The product of its digits is 94500, while the sum is 41.

The square root of 255571691 is about 15986.6097406548. The cubic root of 255571691 is about 634.6061094929.

The spelling of 255571691 in words is "two hundred fifty-five million, five hundred seventy-one thousand, six hundred ninety-one".