194040991 has 2 divisors, whose sum is σ = 194040992. Its totient is φ = 194040990.

The previous prime is 194040967. The next prime is 194041013. The reversal of 194040991 is 199040491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194040991 - 2¹⁵ = 194008223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194040991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194040391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97020495 + 97020496.

It is an arithmetic number, because the mean of its divisors is an integer number (97020496).

Almost surely, 2^194040991 is an apocalyptic number.

194040991 is a deficient number, since it is larger than the sum of its proper divisors (1).

194040991 is an equidigital number, since it uses as much as digits as its factorization.

194040991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 194040991 is about 13929.8596906071. The cubic root of 194040991 is about 578.9368067189.

The spelling of 194040991 in words is "one hundred ninety-four million, forty thousand, nine hundred ninety-one".