197596891 has 4 divisors (see below), whose sum is σ = 197638672. Its totient is φ = 197555112.

The previous prime is 197596877. The next prime is 197596901. The reversal of 197596891 is 198695791.

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

It is a cyclic number.

It is not a de Polignac number, because 197596891 - 2⁵ = 197596859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197596871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12735 + ... + 23608.

It is an arithmetic number, because the mean of its divisors is an integer number (49409668).

Almost surely, 2^197596891 is an apocalyptic number.

197596891 is a deficient number, since it is larger than the sum of its proper divisors (41781).

197596891 is an equidigital number, since it uses as much as digits as its factorization.

197596891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41780.

The product of its digits is 1224720, while the sum is 55.

The square root of 197596891 is about 14056.9161269462. The cubic root of 197596891 is about 582.4518589526.

The spelling of 197596891 in words is "one hundred ninety-seven million, five hundred ninety-six thousand, eight hundred ninety-one".