994589338681 has 9 divisors (see below), whose sum is σ = 1049711239791. Its totient is φ = 942224580144.

The previous prime is 994589338679. The next prime is 994589338693. The reversal of 994589338681 is 186833985499.

The square root of 994589338681 is 997291.

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

994589338681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 162845338681 + 831744000000 = 403541^2 + 912000^2 .

It is not a de Polignac number, because 994589338681 - 2¹ = 994589338679 is a prime.

It is a super-2 number, since 2×994589338681² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (994589338651) 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, 18922285 + ... + 18974773.

It is an arithmetic number, because the mean of its divisors is an integer number (116634582199).

Almost surely, 2^994589338681 is an apocalyptic number.

994589338681 is the 997291-st square number.

994589338681 is the 498646-th centered octagonal number.

It is an amenable number.

994589338681 is a deficient number, since it is larger than the sum of its proper divisors (55121901110).

994589338681 is an frugal number, since it uses more digits than its factorization.

994589338681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105016 (or 52508 counting only the distinct ones).

The product of its digits is 403107840, while the sum is 73.

The spelling of 994589338681 in words is "nine hundred ninety-four billion, five hundred eighty-nine million, three hundred thirty-eight thousand, six hundred eighty-one".