196568891 has 4 divisors (see below), whose sum is σ = 200277792. Its totient is φ = 192859992.

The previous prime is 196568881. The next prime is 196568903. The reversal of 196568891 is 198865691.

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 196568891 - 2¹⁴ = 196552507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 3708847 = 196568891 / (1 + 9 + 6 + 5 + 6 + 8 + 8 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196568831) 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, 1854371 + ... + 1854476.

It is an arithmetic number, because the mean of its divisors is an integer number (50069448).

Almost surely, 2^196568891 is an apocalyptic number.

196568891 is a deficient number, since it is larger than the sum of its proper divisors (3708901).

196568891 is an equidigital number, since it uses as much as digits as its factorization.

196568891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708900.

The product of its digits is 933120, while the sum is 53.

The square root of 196568891 is about 14020.3028141335. The cubic root of 196568891 is about 581.4400315021.

The spelling of 196568891 in words is "one hundred ninety-six million, five hundred sixty-eight thousand, eight hundred ninety-one".