993328981 has 2 divisors, whose sum is σ = 993328982. Its totient is φ = 993328980.

The previous prime is 993328961. The next prime is 993329011. The reversal of 993328981 is 189823399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 975562756 + 17766225 = 31234^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 993328981 - 2¹¹ = 993326933 is a prime.

It is a super-2 number, since 2×993328981² = 1973404928988996722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993328961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496664490 + 496664491.

It is an arithmetic number, because the mean of its divisors is an integer number (496664491).

Almost surely, 2^993328981 is an apocalyptic number.

It is an amenable number.

993328981 is a deficient number, since it is larger than the sum of its proper divisors (1).

993328981 is an equidigital number, since it uses as much as digits as its factorization.

993328981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 52.

The square root of 993328981 is about 31517.1220291447. The cubic root of 993328981 is about 997.7713638707.

The spelling of 993328981 in words is "nine hundred ninety-three million, three hundred twenty-eight thousand, nine hundred eighty-one".