251005042 has 8 divisors (see below), whose sum is σ = 377734896. Its totient is φ = 125093412.

The previous prime is 251005037. The next prime is 251005087. The reversal of 251005042 is 240500152.

251005042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×251005042² = 126007062218843528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203788 + ... + 205015.

It is an arithmetic number, because the mean of its divisors is an integer number (47216862).

Almost surely, 2^251005042 is an apocalyptic number.

251005042 is a deficient number, since it is larger than the sum of its proper divisors (126729854).

251005042 is a wasteful number, since it uses less digits than its factorization.

251005042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409112.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 251005042 is about 15843.1386410648. The cubic root of 251005042 is about 630.8035785968.

Adding to 251005042 its reverse (240500152), we get a palindrome (491505194).

The spelling of 251005042 in words is "two hundred fifty-one million, five thousand, forty-two".