993491617 has 2 divisors, whose sum is σ = 993491618. Its totient is φ = 993491616.

The previous prime is 993491579. The next prime is 993491633. The reversal of 993491617 is 716194399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 862068321 + 131423296 = 29361^2 + 11464^2 .

It is an emirp because it is prime and its reverse (716194399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 993491617 - 2⁷ = 993491489 is a prime.

It is not a weakly prime, because it can be changed into another prime (993491717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496745808 + 496745809.

It is an arithmetic number, because the mean of its divisors is an integer number (496745809).

Almost surely, 2^993491617 is an apocalyptic number.

It is an amenable number.

993491617 is a deficient number, since it is larger than the sum of its proper divisors (1).

993491617 is an equidigital number, since it uses as much as digits as its factorization.

993491617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 993491617 is about 31519.7020449115. The cubic root of 993491617 is about 997.8258153469.

The spelling of 993491617 in words is "nine hundred ninety-three million, four hundred ninety-one thousand, six hundred seventeen".