993415021 has 2 divisors, whose sum is σ = 993415022. Its totient is φ = 993415020.

The previous prime is 993415001. The next prime is 993415081. The reversal of 993415021 is 120514399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511392996 + 482022025 = 22614^2 + 21955^2 .

It is a cyclic number.

It is not a de Polignac number, because 993415021 - 2²⁷ = 859197293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993415001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496707510 + 496707511.

It is an arithmetic number, because the mean of its divisors is an integer number (496707511).

Almost surely, 2^993415021 is an apocalyptic number.

It is an amenable number.

993415021 is a deficient number, since it is larger than the sum of its proper divisors (1).

993415021 is an equidigital number, since it uses as much as digits as its factorization.

993415021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 993415021 is about 31518.4869719344. The cubic root of 993415021 is about 997.8001713022.

The spelling of 993415021 in words is "nine hundred ninety-three million, four hundred fifteen thousand, twenty-one".