255391761 has 4 divisors (see below), whose sum is σ = 340522352. Its totient is φ = 170261172.

The previous prime is 255391729. The next prime is 255391771. The reversal of 255391761 is 167193552.

255391761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 255391761 - 2⁵ = 255391729 is a prime.

It is a super-2 number, since 2×255391761² = 130449903173362242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255391771) 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, 42565291 + ... + 42565296.

It is an arithmetic number, because the mean of its divisors is an integer number (85130588).

Almost surely, 2^255391761 is an apocalyptic number.

It is an amenable number.

255391761 is a deficient number, since it is larger than the sum of its proper divisors (85130591).

255391761 is an equidigital number, since it uses as much as digits as its factorization.

255391761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85130590.

The product of its digits is 56700, while the sum is 39.

The square root of 255391761 is about 15980.9812276969. The cubic root of 255391761 is about 634.4571473970.

The spelling of 255391761 in words is "two hundred fifty-five million, three hundred ninety-one thousand, seven hundred sixty-one".