992839681 has 4 divisors (see below), whose sum is σ = 995652612. Its totient is φ = 990026752.

The previous prime is 992839667. The next prime is 992839691. The reversal of 992839681 is 186938299.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 708411456 + 284428225 = 26616^2 + 16865^2 .

It is a cyclic number.

It is not a de Polignac number, because 992839681 - 2⁵ = 992839649 is a prime.

It is a super-2 number, since 2×992839681² = 1971461264336363522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (992839651) 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, 1405936 + ... + 1406641.

It is an arithmetic number, because the mean of its divisors is an integer number (248913153).

Almost surely, 2^992839681 is an apocalyptic number.

It is an amenable number.

992839681 is a deficient number, since it is larger than the sum of its proper divisors (2812931).

992839681 is a wasteful number, since it uses less digits than its factorization.

992839681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812930.

The product of its digits is 1679616, while the sum is 55.

The square root of 992839681 is about 31509.3586256528. The cubic root of 992839681 is about 997.6075075447.

The spelling of 992839681 in words is "nine hundred ninety-two million, eight hundred thirty-nine thousand, six hundred eighty-one".