251305255 has 4 divisors (see below), whose sum is σ = 301566312. Its totient is φ = 201044200.

The previous prime is 251305253. The next prime is 251305259. The reversal of 251305255 is 552503152.

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

It is not a de Polignac number, because 251305255 - 2¹ = 251305253 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 (251305253) 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, 25130521 + ... + 25130530.

It is an arithmetic number, because the mean of its divisors is an integer number (75391578).

Almost surely, 2^251305255 is an apocalyptic number.

251305255 is a deficient number, since it is larger than the sum of its proper divisors (50261057).

251305255 is an equidigital number, since it uses as much as digits as its factorization.

251305255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50261056.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 251305255 is about 15852.6103528725. The cubic root of 251305255 is about 631.0549679486.

The spelling of 251305255 in words is "two hundred fifty-one million, three hundred five thousand, two hundred fifty-five".