255138591 has 8 divisors (see below), whose sum is σ = 340467840. Its totient is φ = 169950872.

The previous prime is 255138581. The next prime is 255138599. The reversal of 255138591 is 195831552.

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 255138591 - 2¹⁹ = 254614303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255138599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31101 + ... + 38438.

It is an arithmetic number, because the mean of its divisors is an integer number (42558480).

Almost surely, 2^255138591 is an apocalyptic number.

255138591 is a deficient number, since it is larger than the sum of its proper divisors (85329249).

255138591 is a wasteful number, since it uses less digits than its factorization.

255138591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70765.

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

The square root of 255138591 is about 15973.0582857510. The cubic root of 255138591 is about 634.2474321728.

The spelling of 255138591 in words is "two hundred fifty-five million, one hundred thirty-eight thousand, five hundred ninety-one".