8915993 has 2 divisors, whose sum is σ = 8915994. Its totient is φ = 8915992.

The previous prime is 8915981. The next prime is 8915999. The reversal of 8915993 is 3995198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6568969 + 2347024 = 2563^2 + 1532^2 .

It is a cyclic number.

It is not a de Polignac number, because 8915993 - 2¹⁴ = 8899609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8915999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4457996 + 4457997.

It is an arithmetic number, because the mean of its divisors is an integer number (4457997).

Almost surely, 2^8915993 is an apocalyptic number.

It is an amenable number.

8915993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8915993 is an equidigital number, since it uses as much as digits as its factorization.

8915993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 44.

The square root of 8915993 is about 2985.9660078440. The cubic root of 8915993 is about 207.3591670290.

The spelling of 8915993 in words is "eight million, nine hundred fifteen thousand, nine hundred ninety-three".