994671721 has 4 divisors (see below), whose sum is σ = 1004328832. Its totient is φ = 985014612.

The previous prime is 994671707. The next prime is 994671739. The reversal of 994671721 is 127176499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 994671721 - 2¹³ = 994663529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994671121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4828401 + ... + 4828606.

It is an arithmetic number, because the mean of its divisors is an integer number (251082208).

Almost surely, 2^994671721 is an apocalyptic number.

It is an amenable number.

994671721 is a deficient number, since it is larger than the sum of its proper divisors (9657111).

994671721 is a wasteful number, since it uses less digits than its factorization.

994671721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657110.

The product of its digits is 190512, while the sum is 46.

The square root of 994671721 is about 31538.4165899304. The cubic root of 994671721 is about 998.2207431225.

The spelling of 994671721 in words is "nine hundred ninety-four million, six hundred seventy-one thousand, seven hundred twenty-one".