251000242 has 16 divisors (see below), whose sum is σ = 405545472. Its totient is φ = 116170560.

The previous prime is 251000231. The next prime is 251000327. The reversal of 251000242 is 242000152.

It is a super-2 number, since 2×251000242² = 126002242968117128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86583 + ... + 89434.

It is an arithmetic number, because the mean of its divisors is an integer number (25346592).

Almost surely, 2^251000242 is an apocalyptic number.

251000242 is a deficient number, since it is larger than the sum of its proper divisors (154545230).

251000242 is a wasteful number, since it uses less digits than its factorization.

251000242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176073.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 251000242 is about 15842.9871552053. The cubic root of 251000242 is about 630.7995575933.

Adding to 251000242 its reverse (242000152), we get a palindrome (493000394).

The spelling of 251000242 in words is "two hundred fifty-one million, two hundred forty-two", and thus it is an aban number.