255523691 has 2 divisors, whose sum is σ = 255523692. Its totient is φ = 255523690.

The previous prime is 255523687. The next prime is 255523703. The reversal of 255523691 is 196325552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255523691 - 2² = 255523687 is a prime.

It is not a weakly prime, because it can be changed into another prime (255523601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127761845 + 127761846.

It is an arithmetic number, because the mean of its divisors is an integer number (127761846).

Almost surely, 2^255523691 is an apocalyptic number.

255523691 is a deficient number, since it is larger than the sum of its proper divisors (1).

255523691 is an equidigital number, since it uses as much as digits as its factorization.

255523691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 38.

The square root of 255523691 is about 15985.1084137706. The cubic root of 255523691 is about 634.5663776531.

The spelling of 255523691 in words is "two hundred fifty-five million, five hundred twenty-three thousand, six hundred ninety-one".