194589691 has 2 divisors, whose sum is σ = 194589692. Its totient is φ = 194589690.

The previous prime is 194589643. The next prime is 194589709. The reversal of 194589691 is 196985491.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (196985491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194589691 - 2¹¹ = 194587643 is a prime.

It is not a weakly prime, because it can be changed into another prime (194589091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97294845 + 97294846.

It is an arithmetic number, because the mean of its divisors is an integer number (97294846).

Almost surely, 2^194589691 is an apocalyptic number.

194589691 is a deficient number, since it is larger than the sum of its proper divisors (1).

194589691 is an equidigital number, since it uses as much as digits as its factorization.

194589691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 52.

The square root of 194589691 is about 13949.5408885024. The cubic root of 194589691 is about 579.4819899297.

The spelling of 194589691 in words is "one hundred ninety-four million, five hundred eighty-nine thousand, six hundred ninety-one".