251345163 has 4 divisors (see below), whose sum is σ = 335126888. Its totient is φ = 167563440.

The previous prime is 251345161. The next prime is 251345197. The reversal of 251345163 is 361543152.

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

It is not a de Polignac number, because 251345163 - 2¹ = 251345161 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 251345163.

It is not an unprimeable number, because it can be changed into a prime (251345161) 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, 41890858 + ... + 41890863.

It is an arithmetic number, because the mean of its divisors is an integer number (83781722).

Almost surely, 2^251345163 is an apocalyptic number.

251345163 is a deficient number, since it is larger than the sum of its proper divisors (83781725).

251345163 is an equidigital number, since it uses as much as digits as its factorization.

251345163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83781724.

The product of its digits is 10800, while the sum is 30.

The square root of 251345163 is about 15853.8690230492. The cubic root of 251345163 is about 631.0883706308.

The spelling of 251345163 in words is "two hundred fifty-one million, three hundred forty-five thousand, one hundred sixty-three".