858993917 has 2 divisors, whose sum is σ = 858993918. Its totient is φ = 858993916.

The previous prime is 858993859. The next prime is 858993923. The reversal of 858993917 is 719399858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765020281 + 93973636 = 27659^2 + 9694^2 .

It is a cyclic number.

It is not a de Polignac number, because 858993917 - 2¹⁶ = 858928381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858993937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429496958 + 429496959.

It is an arithmetic number, because the mean of its divisors is an integer number (429496959).

Almost surely, 2^858993917 is an apocalyptic number.

It is an amenable number.

858993917 is a deficient number, since it is larger than the sum of its proper divisors (1).

858993917 is an equidigital number, since it uses as much as digits as its factorization.

858993917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 59.

The square root of 858993917 is about 29308.5980046812. The cubic root of 858993917 is about 950.5975619973.

The spelling of 858993917 in words is "eight hundred fifty-eight million, nine hundred ninety-three thousand, nine hundred seventeen".