255121551 has 6 divisors (see below), whose sum is σ = 368508920. Its totient is φ = 170081028.

The previous prime is 255121547. The next prime is 255121553. The reversal of 255121551 is 155121552.

It is not a de Polignac number, because 255121551 - 2² = 255121547 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 (255121553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14173411 + ... + 14173428.

Almost surely, 2^255121551 is an apocalyptic number.

255121551 is a deficient number, since it is larger than the sum of its proper divisors (113387369).

255121551 is a wasteful number, since it uses less digits than its factorization.

255121551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28346845 (or 28346842 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 255121551 is about 15972.5248786784. The cubic root of 255121551 is about 634.2333119818.

Subtracting from 255121551 its reverse (155121552), we obtain a palindrome (99999999).

The spelling of 255121551 in words is "two hundred fifty-five million, one hundred twenty-one thousand, five hundred fifty-one".