196523891 has 8 divisors (see below), whose sum is σ = 205285920. Its totient is φ = 187780032.

The previous prime is 196523869. The next prime is 196523917. The reversal of 196523891 is 198325691.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 196523891 - 2²² = 192329587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196523801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20591 + ... + 28583.

It is an arithmetic number, because the mean of its divisors is an integer number (25660740).

Almost surely, 2^196523891 is an apocalyptic number.

196523891 is a deficient number, since it is larger than the sum of its proper divisors (8762029).

196523891 is a wasteful number, since it uses less digits than its factorization.

196523891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9085.

The product of its digits is 116640, while the sum is 44.

The square root of 196523891 is about 14018.6979067244. The cubic root of 196523891 is about 581.3956589361.

The spelling of 196523891 in words is "one hundred ninety-six million, five hundred twenty-three thousand, eight hundred ninety-one".