189658691 has 2 divisors, whose sum is σ = 189658692. Its totient is φ = 189658690.

The previous prime is 189658663. The next prime is 189658717. The reversal of 189658691 is 196856981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189658691 - 2¹⁴ = 189642307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189658631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94829345 + 94829346.

It is an arithmetic number, because the mean of its divisors is an integer number (94829346).

Almost surely, 2^189658691 is an apocalyptic number.

189658691 is a deficient number, since it is larger than the sum of its proper divisors (1).

189658691 is an equidigital number, since it uses as much as digits as its factorization.

189658691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 189658691 is about 13771.6626084144. The cubic root of 189658691 is about 574.5452646667.

The spelling of 189658691 in words is "one hundred eighty-nine million, six hundred fifty-eight thousand, six hundred ninety-one".