909189697 has 4 divisors (see below), whose sum is σ = 979127380. Its totient is φ = 839252016.

The previous prime is 909189647. The next prime is 909189763. The reversal of 909189697 is 796981909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 796981909 = 43 ⋅18534463.

It can be written as a sum of positive squares in 2 ways, for example, as 492662416 + 416527281 = 22196^2 + 20409^2 .

It is a cyclic number.

It is not a de Polignac number, because 909189697 - 2⁷ = 909189569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909189647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34968822 + ... + 34968847.

It is an arithmetic number, because the mean of its divisors is an integer number (244781845).

Almost surely, 2^909189697 is an apocalyptic number.

It is an amenable number.

909189697 is a deficient number, since it is larger than the sum of its proper divisors (69937683).

909189697 is a wasteful number, since it uses less digits than its factorization.

909189697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69937682.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 909189697 is about 30152.7726254154. The cubic root of 909189697 is about 968.7643944195.

The spelling of 909189697 in words is "nine hundred nine million, one hundred eighty-nine thousand, six hundred ninety-seven".