251630466 has 8 divisors (see below), whose sum is σ = 503260944. Its totient is φ = 83876820.

The previous prime is 251630459. The next prime is 251630473. The reversal of 251630466 is 664036152.

It is an interprime number because it is at equal distance from previous prime (251630459) and next prime (251630473).

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

251630466 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, 20969200 + ... + 20969211.

It is an arithmetic number, because the mean of its divisors is an integer number (62907618).

Almost surely, 2^251630466 is an apocalyptic number.

251630466 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.

251630466 is a wasteful number, since it uses less digits than its factorization.

251630466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41938416.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 251630466 is about 15862.8643693376. The cubic root of 251630466 is about 631.3270640680.

The spelling of 251630466 in words is "two hundred fifty-one million, six hundred thirty thousand, four hundred sixty-six".