194518859 has 2 divisors, whose sum is σ = 194518860. Its totient is φ = 194518858.

The previous prime is 194518847. The next prime is 194518861. The reversal of 194518859 is 958815491.

It is a strong prime.

It is an emirp because it is prime and its reverse (958815491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194518859 - 2¹² = 194514763 is a prime.

Together with 194518861, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194548859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97259429 + 97259430.

It is an arithmetic number, because the mean of its divisors is an integer number (97259430).

Almost surely, 2^194518859 is an apocalyptic number.

194518859 is a deficient number, since it is larger than the sum of its proper divisors (1).

194518859 is an equidigital number, since it uses as much as digits as its factorization.

194518859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 50.

The square root of 194518859 is about 13947.0017925001. The cubic root of 194518859 is about 579.4116695727.

Subtracting from 194518859 its sum of digits (50), we obtain a square (194518809 = 13947²).

The spelling of 194518859 in words is "one hundred ninety-four million, five hundred eighteen thousand, eight hundred fifty-nine".