196648891 has 4 divisors (see below), whose sum is σ = 196872984. Its totient is φ = 196424800.

The previous prime is 196648889. The next prime is 196648897. The reversal of 196648891 is 198846691.

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 196648891 - 2¹ = 196648889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196648897) 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, 110725 + ... + 112486.

It is an arithmetic number, because the mean of its divisors is an integer number (49218246).

Almost surely, 2^196648891 is an apocalyptic number.

196648891 is a deficient number, since it is larger than the sum of its proper divisors (224093).

196648891 is an equidigital number, since it uses as much as digits as its factorization.

196648891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224092.

The product of its digits is 746496, while the sum is 52.

The square root of 196648891 is about 14023.1555293379. The cubic root of 196648891 is about 581.5188993457.

The spelling of 196648891 in words is "one hundred ninety-six million, six hundred forty-eight thousand, eight hundred ninety-one".