251140741242 has 8 divisors (see below), whose sum is σ = 502281482496. Its totient is φ = 83713580412.

The previous prime is 251140741213. The next prime is 251140741259. The reversal of 251140741242 is 242147041152.

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

251140741242 is an admirable number.

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, 20928395098 + ... + 20928395109.

It is an arithmetic number, because the mean of its divisors is an integer number (62785185312).

Almost surely, 2^251140741242 is an apocalyptic number.

251140741242 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.

251140741242 is a wasteful number, since it uses less digits than its factorization.

251140741242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41856790212.

The product of its (nonzero) digits is 17920, while the sum is 33.

Adding to 251140741242 its reverse (242147041152), we get a palindrome (493287782394).

The spelling of 251140741242 in words is "two hundred fifty-one billion, one hundred forty million, seven hundred forty-one thousand, two hundred forty-two".