251440100542 has 8 divisors (see below), whose sum is σ = 377283133656. Its totient is φ = 125679055992.

The previous prime is 251440100503. The next prime is 251440100551. The reversal of 251440100542 is 245001044152.

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

It is a self number, because there is not a number n which added to its sum of digits gives 251440100542.

It is a congruent 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, 20489473 + ... + 20501740.

It is an arithmetic number, because the mean of its divisors is an integer number (47160391707).

Almost surely, 2^251440100542 is an apocalyptic number.

251440100542 is a deficient number, since it is larger than the sum of its proper divisors (125843033114).

251440100542 is a wasteful number, since it uses less digits than its factorization.

251440100542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40994282.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 251440100542 its reverse (245001044152), we get a palindrome (496441144694).

The spelling of 251440100542 in words is "two hundred fifty-one billion, four hundred forty million, one hundred thousand, five hundred forty-two".