251242433 has 4 divisors (see below), whose sum is σ = 270568788. Its totient is φ = 231916080.

The previous prime is 251242427. The next prime is 251242447. The reversal of 251242433 is 334242152.

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 147671104 + 103571329 = 12152^2 + 10177^2 .

It is a cyclic number.

It is not a de Polignac number, because 251242433 - 2⁴ = 251242417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251242463) 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, 9663158 + ... + 9663183.

It is an arithmetic number, because the mean of its divisors is an integer number (67642197).

Almost surely, 2^251242433 is an apocalyptic number.

It is an amenable number.

251242433 is a deficient number, since it is larger than the sum of its proper divisors (19326355).

251242433 is a wasteful number, since it uses less digits than its factorization.

251242433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19326354.

The product of its digits is 5760, while the sum is 26.

The square root of 251242433 is about 15850.6287887894. The cubic root of 251242433 is about 631.0023792631.

Adding to 251242433 its reverse (334242152), we get a palindrome (585484585).

The spelling of 251242433 in words is "two hundred fifty-one million, two hundred forty-two thousand, four hundred thirty-three".