196339991 has 4 divisors (see below), whose sum is σ = 196657800. Its totient is φ = 196022184.

The previous prime is 196339943. The next prime is 196339993. The reversal of 196339991 is 199933691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199933691 = 157 ⋅1273463.

It is a cyclic number.

It is not a de Polignac number, because 196339991 - 2²² = 192145687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196339993) 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 in 3 ways as a sum of consecutive naturals, for example, 157976 + ... + 159213.

It is an arithmetic number, because the mean of its divisors is an integer number (49164450).

Almost surely, 2^196339991 is an apocalyptic number.

196339991 is a deficient number, since it is larger than the sum of its proper divisors (317809).

196339991 is an equidigital number, since it uses as much as digits as its factorization.

196339991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317808.

The product of its digits is 354294, while the sum is 50.

The square root of 196339991 is about 14012.1372745203. The cubic root of 196339991 is about 581.2142526133.

The spelling of 196339991 in words is "one hundred ninety-six million, three hundred thirty-nine thousand, nine hundred ninety-one".