251217514242 has 24 divisors (see below), whose sum is σ = 561862828800. Its totient is φ = 81037907640.

The previous prime is 251217514241. The next prime is 251217514291. The reversal of 251217514242 is 242415712152.

251217514242 is a `hidden beast` number, since 2 + 512 + 17 + 51 + 42 + 42 = 666.

It is a super-2 number, since 2×251217514242² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251217514197 and 251217514206.

It is not an unprimeable number, because it can be changed into a prime (251217514241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225104742 + ... + 225105857.

It is an arithmetic number, because the mean of its divisors is an integer number (23410951200).

Almost surely, 2^251217514242 is an apocalyptic number.

251217514242 is an abundant number, since it is smaller than the sum of its proper divisors (310645314558).

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

251217514242 is a wasteful number, since it uses less digits than its factorization.

251217514242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450210638 (or 450210635 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The spelling of 251217514242 in words is "two hundred fifty-one billion, two hundred seventeen million, five hundred fourteen thousand, two hundred forty-two".