251129994 has 8 divisors (see below), whose sum is σ = 502260000. Its totient is φ = 83709996.

The previous prime is 251129987. The next prime is 251130017. The reversal of 251129994 is 499921152.

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

251129994 is an admirable number.

It is an unprimeable number.

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, 20927494 + ... + 20927505.

It is an arithmetic number, because the mean of its divisors is an integer number (62782500).

Almost surely, 2^251129994 is an apocalyptic number.

251129994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251129994 is a wasteful number, since it uses less digits than its factorization.

251129994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41855004.

The product of its digits is 58320, while the sum is 42.

The square root of 251129994 is about 15847.0815609689. The cubic root of 251129994 is about 630.9082339889.

The spelling of 251129994 in words is "two hundred fifty-one million, one hundred twenty-nine thousand, nine hundred ninety-four".