97181809 has 8 divisors (see below), whose sum is σ = 103517568. Its totient is φ = 90914880.

The previous prime is 97181803. The next prime is 97181837. The reversal of 97181809 is 90818179.

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 97181809 - 2³ = 97181801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97181801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14277 + ... + 19954.

It is an arithmetic number, because the mean of its divisors is an integer number (12939696).

Almost surely, 2^97181809 is an apocalyptic number.

It is an amenable number.

97181809 is a deficient number, since it is larger than the sum of its proper divisors (6335759).

97181809 is a wasteful number, since it uses less digits than its factorization.

97181809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34415.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 97181809 is about 9858.0834344207. The cubic root of 97181809 is about 459.7569746530.

The spelling of 97181809 in words is "ninety-seven million, one hundred eighty-one thousand, eight hundred nine".