196771691 has 2 divisors, whose sum is σ = 196771692. Its totient is φ = 196771690.

The previous prime is 196771643. The next prime is 196771703. The reversal of 196771691 is 196177691.

It is a strong prime.

It is an emirp because it is prime and its reverse (196177691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196771691 - 2²² = 192577387 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (196774691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98385845 + 98385846.

It is an arithmetic number, because the mean of its divisors is an integer number (98385846).

Almost surely, 2^196771691 is an apocalyptic number.

196771691 is a deficient number, since it is larger than the sum of its proper divisors (1).

196771691 is an equidigital number, since it uses as much as digits as its factorization.

196771691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 47.

The square root of 196771691 is about 14027.5333184420. The cubic root of 196771691 is about 581.6399198801.

The spelling of 196771691 in words is "one hundred ninety-six million, seven hundred seventy-one thousand, six hundred ninety-one".