199557197 has 4 divisors (see below), whose sum is σ = 228065376. Its totient is φ = 171049020.

The previous prime is 199557191. The next prime is 199557263. The reversal of 199557197 is 791755991.

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: 791755991 = 13 ⋅60904307.

It is a cyclic number.

It is not a de Polignac number, because 199557197 - 2⁸ = 199556941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199557191) 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, 14254079 + ... + 14254092.

It is an arithmetic number, because the mean of its divisors is an integer number (57016344).

Almost surely, 2^199557197 is an apocalyptic number.

It is an amenable number.

199557197 is a deficient number, since it is larger than the sum of its proper divisors (28508179).

199557197 is an equidigital number, since it uses as much as digits as its factorization.

199557197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28508178.

The product of its digits is 893025, while the sum is 53.

The square root of 199557197 is about 14126.4714985732. The cubic root of 199557197 is about 584.3716407940.

The spelling of 199557197 in words is "one hundred ninety-nine million, five hundred fifty-seven thousand, one hundred ninety-seven".