196641905 has 4 divisors (see below), whose sum is σ = 235970292. Its totient is φ = 157313520.

The previous prime is 196641871. The next prime is 196641911. The reversal of 196641905 is 509146691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509146691 = 3221 ⋅158071.

It can be written as a sum of positive squares in 2 ways, for example, as 41589601 + 155052304 = 6449^2 + 12452^2 .

It is a de Polignac number, because none of the positive numbers 2^k-196641905 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19664186 + ... + 19664195.

It is an arithmetic number, because the mean of its divisors is an integer number (58992573).

Almost surely, 2^196641905 is an apocalyptic number.

It is an amenable number.

196641905 is a deficient number, since it is larger than the sum of its proper divisors (39328387).

196641905 is an equidigital number, since it uses as much as digits as its factorization.

196641905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39328386.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 196641905 is about 14022.9064391088. The cubic root of 196641905 is about 581.5120130638.

The spelling of 196641905 in words is "one hundred ninety-six million, six hundred forty-one thousand, nine hundred five".