993215911 has 2 divisors, whose sum is σ = 993215912. Its totient is φ = 993215910.

The previous prime is 993215801. The next prime is 993215929. The reversal of 993215911 is 119512399.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 993215911 - 2²³ = 984827303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993215981) 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 as a sum of consecutive naturals, namely, 496607955 + 496607956.

It is an arithmetic number, because the mean of its divisors is an integer number (496607956).

Almost surely, 2^993215911 is an apocalyptic number.

993215911 is a deficient number, since it is larger than the sum of its proper divisors (1).

993215911 is an equidigital number, since it uses as much as digits as its factorization.

993215911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 40.

The square root of 993215911 is about 31515.3281912151. The cubic root of 993215911 is about 997.7335038763.

The spelling of 993215911 in words is "nine hundred ninety-three million, two hundred fifteen thousand, nine hundred eleven".