251051542242 has 32 divisors (see below), whose sum is σ = 508482678912. Its totient is φ = 82625405184.

The previous prime is 251051542223. The next prime is 251051542283. The reversal of 251051542242 is 242245150152.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394453 + ... + 810984.

It is an arithmetic number, because the mean of its divisors is an integer number (15890083716).

Almost surely, 2^251051542242 is an apocalyptic number.

251051542242 is an abundant number, since it is smaller than the sum of its proper divisors (257431136670).

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

251051542242 is a wasteful number, since it uses less digits than its factorization.

251051542242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205882.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 251051542242 its reverse (242245150152), we get a palindrome (493296692394).

The spelling of 251051542242 in words is "two hundred fifty-one billion, fifty-one million, five hundred forty-two thousand, two hundred forty-two".