251552051 has 4 divisors (see below), whose sum is σ = 251634600. Its totient is φ = 251469504.

The previous prime is 251552047. The next prime is 251552057. The reversal of 251552051 is 150255152.

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 251552051 - 2² = 251552047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251552051.

It is not an unprimeable number, because it can be changed into a prime (251552057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36521 + ... + 42858.

It is an arithmetic number, because the mean of its divisors is an integer number (62908650).

Almost surely, 2^251552051 is an apocalyptic number.

251552051 is a deficient number, since it is larger than the sum of its proper divisors (82549).

251552051 is an equidigital number, since it uses as much as digits as its factorization.

251552051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82548.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 251552051 is about 15860.3925235159. The cubic root of 251552051 is about 631.2614776072.

The spelling of 251552051 in words is "two hundred fifty-one million, five hundred fifty-two thousand, fifty-one".