189507691 has 8 divisors (see below), whose sum is σ = 202460480. Its totient is φ = 176852808.

The previous prime is 189507679. The next prime is 189507707. The reversal of 189507691 is 196705981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189507691 - 2¹¹ = 189505643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189507631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73161 + ... + 75706.

It is an arithmetic number, because the mean of its divisors is an integer number (25307560).

Almost surely, 2^189507691 is an apocalyptic number.

189507691 is a deficient number, since it is larger than the sum of its proper divisors (12952789).

189507691 is a wasteful number, since it uses less digits than its factorization.

189507691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148953.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 189507691 is about 13766.1792448014. The cubic root of 189507691 is about 574.3927461805.

The spelling of 189507691 in words is "one hundred eighty-nine million, five hundred seven thousand, six hundred ninety-one".