109189897 has 4 divisors (see below), whose sum is σ = 109273876. Its totient is φ = 109105920.

The previous prime is 109189891. The next prime is 109189931. The reversal of 109189897 is 798981901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86044176 + 23145721 = 9276^2 + 4811^2 .

It is a cyclic number.

It is not a de Polignac number, because 109189897 - 2¹¹ = 109187849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109189891) 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, 40008 + ... + 42649.

It is an arithmetic number, because the mean of its divisors is an integer number (27318469).

Almost surely, 2^109189897 is an apocalyptic number.

It is an amenable number.

109189897 is a deficient number, since it is larger than the sum of its proper divisors (83979).

109189897 is an equidigital number, since it uses as much as digits as its factorization.

109189897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83978.

The product of its (nonzero) digits is 326592, while the sum is 52.

The square root of 109189897 is about 10449.3969682465. The cubic root of 109189897 is about 477.9628610350.

The spelling of 109189897 in words is "one hundred nine million, one hundred eighty-nine thousand, eight hundred ninety-seven".