196495991 has 4 divisors (see below), whose sum is σ = 196571184. Its totient is φ = 196420800.

The previous prime is 196495987. The next prime is 196495993. The reversal of 196495991 is 199594691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 196495991 - 2² = 196495987 is a prime.

It is a super-2 number, since 2×196495991² = 77221348958144162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196495993) 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, 33530 + ... + 38951.

It is an arithmetic number, because the mean of its divisors is an integer number (49142796).

Almost surely, 2^196495991 is an apocalyptic number.

196495991 is a deficient number, since it is larger than the sum of its proper divisors (75193).

196495991 is an equidigital number, since it uses as much as digits as its factorization.

196495991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75192.

The product of its digits is 787320, while the sum is 53.

The square root of 196495991 is about 14017.7027718525. The cubic root of 196495991 is about 581.3681445434.

The spelling of 196495991 in words is "one hundred ninety-six million, four hundred ninety-five thousand, nine hundred ninety-one".