196400591 has 2 divisors, whose sum is σ = 196400592. Its totient is φ = 196400590.

The previous prime is 196400579. The next prime is 196400599. The reversal of 196400591 is 195004691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196400591 - 2⁶ = 196400527 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196400599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98200295 + 98200296.

It is an arithmetic number, because the mean of its divisors is an integer number (98200296).

Almost surely, 2^196400591 is an apocalyptic number.

196400591 is a deficient number, since it is larger than the sum of its proper divisors (1).

196400591 is an equidigital number, since it uses as much as digits as its factorization.

196400591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 196400591 is about 14014.2995187059. The cubic root of 196400591 is about 581.2740433882.

The spelling of 196400591 in words is "one hundred ninety-six million, four hundred thousand, five hundred ninety-one".