199345897 has 4 divisors (see below), whose sum is σ = 199418436. Its totient is φ = 199273360.

The previous prime is 199345889. The next prime is 199345907. The reversal of 199345897 is 798543991.

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 39677401 + 159668496 = 6299^2 + 12636^2 .

It is a cyclic number.

It is not a de Polignac number, because 199345897 - 2³ = 199345889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199345697) 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, 31978 + ... + 37699.

It is an arithmetic number, because the mean of its divisors is an integer number (49854609).

Almost surely, 2^199345897 is an apocalyptic number.

It is an amenable number.

199345897 is a deficient number, since it is larger than the sum of its proper divisors (72539).

199345897 is an equidigital number, since it uses as much as digits as its factorization.

199345897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72538.

The product of its digits is 2449440, while the sum is 55.

The square root of 199345897 is about 14118.9906508929. The cubic root of 199345897 is about 584.1653150948.

The spelling of 199345897 in words is "one hundred ninety-nine million, three hundred forty-five thousand, eight hundred ninety-seven".