255641591 has 2 divisors, whose sum is σ = 255641592. Its totient is φ = 255641590.

The previous prime is 255641587. The next prime is 255641611. The reversal of 255641591 is 195146552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255641591 - 2² = 255641587 is a prime.

It is a super-2 number, since 2×255641591² = 130705246098022562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255641501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127820795 + 127820796.

It is an arithmetic number, because the mean of its divisors is an integer number (127820796).

Almost surely, 2^255641591 is an apocalyptic number.

255641591 is a deficient number, since it is larger than the sum of its proper divisors (1).

255641591 is an equidigital number, since it uses as much as digits as its factorization.

255641591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 38.

The square root of 255641591 is about 15988.7957958065. The cubic root of 255641591 is about 634.6639600884.

The spelling of 255641591 in words is "two hundred fifty-five million, six hundred forty-one thousand, five hundred ninety-one".