994884558721 has 3 divisors (see below), whose sum is σ = 994885556161. Its totient is φ = 994883561282.

The previous prime is 994884558659. The next prime is 994884558737. The reversal of 994884558721 is 127855488499.

It is a happy number.

The square root of 994884558721 is 997439.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127855488499 = 757 ⋅168897607.

It is not a de Polignac number, because 994884558721 - 2²¹ = 994882461569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994884558221) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 498720 + ... + 1496158.

Almost surely, 2^994884558721 is an apocalyptic number.

994884558721 is the 997439-th square number.

994884558721 is the 498720-th centered octagonal number.

It is an amenable number.

994884558721 is a deficient number, since it is larger than the sum of its proper divisors (997440).

994884558721 is an frugal number, since it uses more digits than its factorization.

994884558721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994878 (or 997439 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 70.

The spelling of 994884558721 in words is "nine hundred ninety-four billion, eight hundred eighty-four million, five hundred fifty-eight thousand, seven hundred twenty-one".