194091497 has 2 divisors, whose sum is σ = 194091498. Its totient is φ = 194091496.

The previous prime is 194091481. The next prime is 194091509. The reversal of 194091497 is 794190491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135047641 + 59043856 = 11621^2 + 7684^2 .

It is a cyclic number.

It is not a de Polignac number, because 194091497 - 2⁴ = 194091481 is a prime.

It is not a weakly prime, because it can be changed into another prime (194091427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97045748 + 97045749.

It is an arithmetic number, because the mean of its divisors is an integer number (97045749).

Almost surely, 2^194091497 is an apocalyptic number.

It is an amenable number.

194091497 is a deficient number, since it is larger than the sum of its proper divisors (1).

194091497 is an equidigital number, since it uses as much as digits as its factorization.

194091497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 194091497 is about 13931.6724408809. The cubic root of 194091497 is about 578.9870319242.

The spelling of 194091497 in words is "one hundred ninety-four million, ninety-one thousand, four hundred ninety-seven".