251516055 has 16 divisors (see below), whose sum is σ = 459915264. Its totient is φ = 114978720.

The previous prime is 251516029. The next prime is 251516081. The reversal of 251516055 is 550615152.

It is an interprime number because it is at equal distance from previous prime (251516029) and next prime (251516081).

It is not a de Polignac number, because 251516055 - 2⁶ = 251515991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1197591 + ... + 1197800.

It is an arithmetic number, because the mean of its divisors is an integer number (28744704).

Almost surely, 2^251516055 is an apocalyptic number.

251516055 is a deficient number, since it is larger than the sum of its proper divisors (208399209).

251516055 is a wasteful number, since it uses less digits than its factorization.

251516055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395406.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 251516055 is about 15859.2577064628. The cubic root of 251516055 is about 631.2313659173.

The spelling of 251516055 in words is "two hundred fifty-one million, five hundred sixteen thousand, fifty-five".