992890680721 has 9 divisors (see below), whose sum is σ = 1016562017979. Its totient is φ = 969758349336.

The previous prime is 992890680659. The next prime is 992890680763. The reversal of 992890680721 is 127086098299.

The square root of 992890680721 is 996439.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10341873025 + 982548807696 = 101695^2 + 991236^2 .

It is not a de Polignac number, because 992890680721 - 2¹⁷ = 992890549649 is a prime.

It is a super-2 number, since 2×992890680721² (a number of 25 digits) contains 22 as substring.

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 992890680721.

It is not an unprimeable number, because it can be changed into a prime (992890687721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42835291 + ... + 42858463.

It is an arithmetic number, because the mean of its divisors is an integer number (112951335331).

Almost surely, 2^992890680721 is an apocalyptic number.

992890680721 is the 996439-th square number.

992890680721 is the 498220-th centered octagonal number.

It is an amenable number.

992890680721 is a deficient number, since it is larger than the sum of its proper divisors (23671337258).

992890680721 is an frugal number, since it uses more digits than its factorization.

992890680721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46432 (or 23216 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 61.

The spelling of 992890680721 in words is "nine hundred ninety-two billion, eight hundred ninety million, six hundred eighty thousand, seven hundred twenty-one".