194755391 has 2 divisors, whose sum is σ = 194755392. Its totient is φ = 194755390.

The previous prime is 194755277. The next prime is 194755397. The reversal of 194755391 is 193557491.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194755391 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 (194755397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97377695 + 97377696.

It is an arithmetic number, because the mean of its divisors is an integer number (97377696).

Almost surely, 2^194755391 is an apocalyptic number.

194755391 is a deficient number, since it is larger than the sum of its proper divisors (1).

194755391 is an equidigital number, since it uses as much as digits as its factorization.

194755391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 194755391 is about 13955.4788882360. The cubic root of 194755391 is about 579.6464263965.

The spelling of 194755391 in words is "one hundred ninety-four million, seven hundred fifty-five thousand, three hundred ninety-one".