196145591 has 2 divisors, whose sum is σ = 196145592. Its totient is φ = 196145590.

The previous prime is 196145563. The next prime is 196145603. The reversal of 196145591 is 195541691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196145591 - 2¹⁴ = 196129207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196145291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98072795 + 98072796.

It is an arithmetic number, because the mean of its divisors is an integer number (98072796).

Almost surely, 2^196145591 is an apocalyptic number.

196145591 is a deficient number, since it is larger than the sum of its proper divisors (1).

196145591 is an equidigital number, since it uses as much as digits as its factorization.

196145591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 41.

The square root of 196145591 is about 14005.1987133350. The cubic root of 196145591 is about 581.0223654669.

The spelling of 196145591 in words is "one hundred ninety-six million, one hundred forty-five thousand, five hundred ninety-one".