196640091 has 6 divisors (see below), whose sum is σ = 284035700. Its totient is φ = 131093388.

The previous prime is 196640083. The next prime is 196640107. The reversal of 196640091 is 190046691.

196640091 is a `hidden beast` number, since 1 + 9 + 6 + 640 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 196640091 - 2³ = 196640083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196640491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10924441 + ... + 10924458.

Almost surely, 2^196640091 is an apocalyptic number.

196640091 is a deficient number, since it is larger than the sum of its proper divisors (87395609).

196640091 is a wasteful number, since it uses less digits than its factorization.

196640091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21848905 (or 21848902 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 196640091 is about 14022.8417590729. The cubic root of 196640091 is about 581.5102249301.

The spelling of 196640091 in words is "one hundred ninety-six million, six hundred forty thousand, ninety-one".