251242144 has 12 divisors (see below), whose sum is σ = 494633034. Its totient is φ = 125621056.

The previous prime is 251242141. The next prime is 251242151. The reversal of 251242144 is 441242152.

It can be written as a sum of positive squares in only one way, i.e., 243734544 + 7507600 = 15612^2 + 2740^2 .

It is a super-2 number, since 2×251242144² = 126245229843433472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251242141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3925627 + ... + 3925690.

Almost surely, 2^251242144 is an apocalyptic number.

It is an amenable number.

251242144 is a deficient number, since it is larger than the sum of its proper divisors (243390890).

251242144 is an equidigital number, since it uses as much as digits as its factorization.

251242144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7851327 (or 7851319 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 251242144 is about 15850.6196724292. The cubic root of 251242144 is about 631.0021373191.

Adding to 251242144 its reverse (441242152), we get a palindrome (692484296).

The spelling of 251242144 in words is "two hundred fifty-one million, two hundred forty-two thousand, one hundred forty-four".