993941521 has 2 divisors, whose sum is σ = 993941522. Its totient is φ = 993941520.

The previous prime is 993941513. The next prime is 993941539. The reversal of 993941521 is 125149399.

993941521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671379921 + 322561600 = 25911^2 + 17960^2 .

It is a cyclic number.

It is not a de Polignac number, because 993941521 - 2³ = 993941513 is a prime.

It is not a weakly prime, because it can be changed into another prime (993941321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496970760 + 496970761.

It is an arithmetic number, because the mean of its divisors is an integer number (496970761).

Almost surely, 2^993941521 is an apocalyptic number.

It is an amenable number.

993941521 is a deficient number, since it is larger than the sum of its proper divisors (1).

993941521 is an equidigital number, since it uses as much as digits as its factorization.

993941521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 993941521 is about 31526.8381066037. The cubic root of 993941521 is about 997.9764148653.

The spelling of 993941521 in words is "nine hundred ninety-three million, nine hundred forty-one thousand, five hundred twenty-one".