255381591 has 4 divisors (see below), whose sum is σ = 340508792. Its totient is φ = 170254392.

The previous prime is 255381587. The next prime is 255381593. The reversal of 255381591 is 195183552.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 255381591 - 2² = 255381587 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 (255381593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42563596 + ... + 42563601.

It is an arithmetic number, because the mean of its divisors is an integer number (85127198).

Almost surely, 2^255381591 is an apocalyptic number.

255381591 is a deficient number, since it is larger than the sum of its proper divisors (85127201).

255381591 is an equidigital number, since it uses as much as digits as its factorization.

255381591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85127200.

The product of its digits is 54000, while the sum is 39.

The square root of 255381591 is about 15980.6630338043. The cubic root of 255381591 is about 634.4487256756.

The spelling of 255381591 in words is "two hundred fifty-five million, three hundred eighty-one thousand, five hundred ninety-one".