194965391 has 2 divisors, whose sum is σ = 194965392. Its totient is φ = 194965390.

The previous prime is 194965349. The next prime is 194965399. The reversal of 194965391 is 193569491.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (193569491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194965391 - 2²⁶ = 127856527 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 (194965399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97482695 + 97482696.

It is an arithmetic number, because the mean of its divisors is an integer number (97482696).

Almost surely, 2^194965391 is an apocalyptic number.

194965391 is a deficient number, since it is larger than the sum of its proper divisors (1).

194965391 is an equidigital number, since it uses as much as digits as its factorization.

194965391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 47.

The square root of 194965391 is about 13963.0007877963. Note that the first 3 decimals coincide. The cubic root of 194965391 is about 579.8546911054.

The spelling of 194965391 in words is "one hundred ninety-four million, nine hundred sixty-five thousand, three hundred ninety-one".