255291551 has 4 divisors (see below), whose sum is σ = 255470400. Its totient is φ = 255112704.

The previous prime is 255291529. The next prime is 255291557. The reversal of 255291551 is 155192552.

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

It is a cyclic number.

It is not a de Polignac number, because 255291551 - 2²² = 251097247 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 (255291557) 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, 87266 + ... + 90143.

It is an arithmetic number, because the mean of its divisors is an integer number (63867600).

Almost surely, 2^255291551 is an apocalyptic number.

255291551 is a deficient number, since it is larger than the sum of its proper divisors (178849).

255291551 is a wasteful number, since it uses less digits than its factorization.

255291551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178848.

The product of its digits is 22500, while the sum is 35.

The square root of 255291551 is about 15977.8456307476. The cubic root of 255291551 is about 634.3741542888.

The spelling of 255291551 in words is "two hundred fifty-five million, two hundred ninety-one thousand, five hundred fifty-one".