199740097 has 4 divisors (see below), whose sum is σ = 205138516. Its totient is φ = 194341680.

The previous prime is 199740071. The next prime is 199740113. The reversal of 199740097 is 790047991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 790047991 = 10313 ⋅76607.

It can be written as a sum of positive squares in 2 ways, for example, as 99920016 + 99820081 = 9996^2 + 9991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199740097 is a prime.

It is a super-2 number, since 2×199740097² = 79792212699138818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199740007) 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, 2699154 + ... + 2699227.

It is an arithmetic number, because the mean of its divisors is an integer number (51284629).

Almost surely, 2^199740097 is an apocalyptic number.

It is an amenable number.

199740097 is a deficient number, since it is larger than the sum of its proper divisors (5398419).

199740097 is an equidigital number, since it uses as much as digits as its factorization.

199740097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5398418.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 199740097 is about 14132.9436778047. The cubic root of 199740097 is about 584.5501175047.

The spelling of 199740097 in words is "one hundred ninety-nine million, seven hundred forty thousand, ninety-seven".