251379138 has 8 divisors (see below), whose sum is σ = 502758288. Its totient is φ = 83793044.

The previous prime is 251379133. The next prime is 251379157. The reversal of 251379138 is 831973152.

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

251379138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 251379096 and 251379105.

It is not an unprimeable number, because it can be changed into a prime (251379133) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 20948256 + ... + 20948267.

It is an arithmetic number, because the mean of its divisors is an integer number (62844786).

Almost surely, 2^251379138 is an apocalyptic number.

251379138 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.

251379138 is a wasteful number, since it uses less digits than its factorization.

251379138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41896528.

The product of its digits is 45360, while the sum is 39.

The square root of 251379138 is about 15854.9404918467. The cubic root of 251379138 is about 631.1168046524.

The spelling of 251379138 in words is "two hundred fifty-one million, three hundred seventy-nine thousand, one hundred thirty-eight".