993319681 has 4 divisors (see below), whose sum is σ = 1005287472. Its totient is φ = 981351892.

The previous prime is 993319661. The next prime is 993319697. The reversal of 993319681 is 186913399.

993319681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 993319681 - 2⁷ = 993319553 is a prime.

It is a super-2 number, since 2×993319681² = 1973367977323883522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993319661) 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, 5983771 + ... + 5983936.

It is an arithmetic number, because the mean of its divisors is an integer number (251321868).

Almost surely, 2^993319681 is an apocalyptic number.

It is an amenable number.

993319681 is a deficient number, since it is larger than the sum of its proper divisors (11967791).

993319681 is a wasteful number, since it uses less digits than its factorization.

993319681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11967790.

The product of its digits is 314928, while the sum is 49.

The square root of 993319681 is about 31516.9744899475. The cubic root of 993319681 is about 997.7682499972.

The spelling of 993319681 in words is "nine hundred ninety-three million, three hundred nineteen thousand, six hundred eighty-one".