992187368251 has 4 divisors (see below), whose sum is σ = 992189401504. Its totient is φ = 992185335000.

The previous prime is 992187368231. The next prime is 992187368281. The reversal of 992187368251 is 152863781299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152863781299 = 251 ⋅609019049.

It is a 3-Lehmer number, since φ(992187368251) divides (992187368251-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-992187368251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 992187368251.

It is not an unprimeable number, because it can be changed into a prime (992187368231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203326 + ... + 1423276.

It is an arithmetic number, because the mean of its divisors is an integer number (248047350376).

Almost surely, 2^992187368251 is an apocalyptic number.

992187368251 is the 813301-st pentagonal number.

992187368251 is a deficient number, since it is larger than the sum of its proper divisors (2033253).

992187368251 is a wasteful number, since it uses less digits than its factorization.

992187368251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033252.

The product of its digits is 13063680, while the sum is 61.

The spelling of 992187368251 in words is "nine hundred ninety-two billion, one hundred eighty-seven million, three hundred sixty-eight thousand, two hundred fifty-one".