199554997 has 4 divisors (see below), whose sum is σ = 203800896. Its totient is φ = 195309100.

The previous prime is 199554961. The next prime is 199555001. The reversal of 199554997 is 799455991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799455991 = 17 ⋅47026823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199554997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199554937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2122879 + ... + 2122972.

It is an arithmetic number, because the mean of its divisors is an integer number (50950224).

Almost surely, 2^199554997 is an apocalyptic number.

It is an amenable number.

199554997 is a deficient number, since it is larger than the sum of its proper divisors (4245899).

199554997 is an equidigital number, since it uses as much as digits as its factorization.

199554997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245898.

The product of its digits is 4592700, while the sum is 58.

The square root of 199554997 is about 14126.3936303644. The cubic root of 199554997 is about 584.3694933356.

The spelling of 199554997 in words is "one hundred ninety-nine million, five hundred fifty-four thousand, nine hundred ninety-seven".