196109591 has 2 divisors, whose sum is σ = 196109592. Its totient is φ = 196109590.

The previous prime is 196109587. The next prime is 196109623. The reversal of 196109591 is 195901691.

196109591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 196109591 - 2² = 196109587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196109561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98054795 + 98054796.

It is an arithmetic number, because the mean of its divisors is an integer number (98054796).

Almost surely, 2^196109591 is an apocalyptic number.

196109591 is a deficient number, since it is larger than the sum of its proper divisors (1).

196109591 is an equidigital number, since it uses as much as digits as its factorization.

196109591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 196109591 is about 14003.9134173273. The cubic root of 196109591 is about 580.9868168984.

The spelling of 196109591 in words is "one hundred ninety-six million, one hundred nine thousand, five hundred ninety-one".