189919697 has 4 divisors (see below), whose sum is σ = 207185136. Its totient is φ = 172654260.

The previous prime is 189919679. The next prime is 189919729. The reversal of 189919697 is 796919981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189919697 - 2⁶ = 189919633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189919897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8632703 + ... + 8632724.

It is an arithmetic number, because the mean of its divisors is an integer number (51796284).

Almost surely, 2^189919697 is an apocalyptic number.

It is an amenable number.

189919697 is a deficient number, since it is larger than the sum of its proper divisors (17265439).

189919697 is a wasteful number, since it uses less digits than its factorization.

189919697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17265438.

The product of its digits is 2204496, while the sum is 59.

The square root of 189919697 is about 13781.1355482776. The cubic root of 189919697 is about 574.8087046074.

The spelling of 189919697 in words is "one hundred eighty-nine million, nine hundred nineteen thousand, six hundred ninety-seven".