993391859 has 4 divisors (see below), whose sum is σ = 1014527904. Its totient is φ = 972255816.

The previous prime is 993391849. The next prime is 993391871. The reversal of 993391859 is 958193399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958193399 = 271 ⋅3535769.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993391859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993391849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10567952 + ... + 10568045.

It is an arithmetic number, because the mean of its divisors is an integer number (253631976).

Almost surely, 2^993391859 is an apocalyptic number.

993391859 is a deficient number, since it is larger than the sum of its proper divisors (21136045).

993391859 is a wasteful number, since it uses less digits than its factorization.

993391859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21136044.

The product of its digits is 2361960, while the sum is 56.

The square root of 993391859 is about 31518.1195346423. The cubic root of 993391859 is about 997.7924164946.

The spelling of 993391859 in words is "nine hundred ninety-three million, three hundred ninety-one thousand, eight hundred fifty-nine".