251196242 has 12 divisors (see below), whose sum is σ = 414162798. Its totient is φ = 114180000.

The previous prime is 251196241. The next prime is 251196329. The reversal of 251196242 is 242691152.

It can be written as a sum of positive squares in only one way, i.e., 173949721 + 77246521 = 13189^2 + 8789^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251196199 and 251196208.

It is not an unprimeable number, because it can be changed into a prime (251196241) 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 5 ways as a sum of consecutive naturals, for example, 518759 + ... + 519242.

Almost surely, 2^251196242 is an apocalyptic number.

251196242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

251196242 is a deficient number, since it is larger than the sum of its proper divisors (162966556).

251196242 is a wasteful number, since it uses less digits than its factorization.

251196242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038025 (or 1038014 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 251196242 is about 15849.1716502788. The cubic root of 251196242 is about 630.9637068980.

The spelling of 251196242 in words is "two hundred fifty-one million, one hundred ninety-six thousand, two hundred forty-two".