255518493 has 4 divisors (see below), whose sum is σ = 340691328. Its totient is φ = 170345660.

The previous prime is 255518491. The next prime is 255518581. The reversal of 255518493 is 394815552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255518493 - 2¹ = 255518491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255518491) 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, 42586413 + ... + 42586418.

It is an arithmetic number, because the mean of its divisors is an integer number (85172832).

Almost surely, 2^255518493 is an apocalyptic number.

It is an amenable number.

255518493 is a deficient number, since it is larger than the sum of its proper divisors (85172835).

255518493 is an equidigital number, since it uses as much as digits as its factorization.

255518493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85172834.

The product of its digits is 216000, while the sum is 42.

The square root of 255518493 is about 15984.9458241184. The cubic root of 255518493 is about 634.5620747274.

The spelling of 255518493 in words is "two hundred fifty-five million, five hundred eighteen thousand, four hundred ninety-three".