251243055 has 96 divisors (see below), whose sum is σ = 515548800. Its totient is φ = 110822400.

The previous prime is 251243033. The next prime is 251243071. The reversal of 251243055 is 550342152.

It is a happy number.

It is not a de Polignac number, because 251243055 - 2⁶ = 251242991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1686121 + ... + 1686269.

It is an arithmetic number, because the mean of its divisors is an integer number (5370300).

Almost surely, 2^251243055 is an apocalyptic number.

251243055 is an abundant number, since it is smaller than the sum of its proper divisors (264305745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251243055 is a wasteful number, since it uses less digits than its factorization.

251243055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 251243055 is about 15850.6484094500. The cubic root of 251243055 is about 631.0028999861.

The spelling of 251243055 in words is "two hundred fifty-one million, two hundred forty-three thousand, fifty-five".