251872469 has 4 divisors (see below), whose sum is σ = 252732396. Its totient is φ = 251012544.

The previous prime is 251872451. The next prime is 251872507. The reversal of 251872469 is 964278152.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 230128900 + 21743569 = 15170^2 + 4663^2 .

It is a cyclic number.

It is not a de Polignac number, because 251872469 - 2²⁰ = 250823893 is a prime.

It is a super-2 number, since 2×251872469² = 126879481280311922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251872669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429524 + ... + 430109.

It is an arithmetic number, because the mean of its divisors is an integer number (63183099).

Almost surely, 2^251872469 is an apocalyptic number.

It is an amenable number.

251872469 is a deficient number, since it is larger than the sum of its proper divisors (859927).

251872469 is an equidigital number, since it uses as much as digits as its factorization.

251872469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859926.

The product of its digits is 241920, while the sum is 44.

The square root of 251872469 is about 15870.4905091179. The cubic root of 251872469 is about 631.5293899798.

The spelling of 251872469 in words is "two hundred fifty-one million, eight hundred seventy-two thousand, four hundred sixty-nine".