189357691 has 2 divisors, whose sum is σ = 189357692. Its totient is φ = 189357690.

The previous prime is 189357683. The next prime is 189357737. The reversal of 189357691 is 196753981.

It is a weak prime.

It is an emirp because it is prime and its reverse (196753981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189357691 - 2³ = 189357683 is a prime.

It is not a weakly prime, because it can be changed into another prime (189357661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94678845 + 94678846.

It is an arithmetic number, because the mean of its divisors is an integer number (94678846).

Almost surely, 2^189357691 is an apocalyptic number.

189357691 is a deficient number, since it is larger than the sum of its proper divisors (1).

189357691 is an equidigital number, since it uses as much as digits as its factorization.

189357691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 189357691 is about 13760.7300315063. The cubic root of 189357691 is about 574.2411575145.

The spelling of 189357691 in words is "one hundred eighty-nine million, three hundred fifty-seven thousand, six hundred ninety-one".