196351821 has 6 divisors (see below), whose sum is σ = 283619310. Its totient is φ = 130901208.

The previous prime is 196351811. The next prime is 196351847. The reversal of 196351821 is 128153691.

196351821 is a `hidden beast` number, since 1 + 9 + 635 + 18 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135978921 + 60372900 = 11661^2 + 7770^2 .

It is not a de Polignac number, because 196351821 - 2⁵ = 196351789 is a prime.

It is a super-2 number, since 2×196351821² = 77108075220032082, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196351801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10908426 + ... + 10908443.

It is an arithmetic number, because the mean of its divisors is an integer number (47269885).

Almost surely, 2^196351821 is an apocalyptic number.

It is an amenable number.

196351821 is a deficient number, since it is larger than the sum of its proper divisors (87267489).

196351821 is a wasteful number, since it uses less digits than its factorization.

196351821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21816875 (or 21816872 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 196351821 is about 14012.5594021934. The cubic root of 196351821 is about 581.2259256071.

The spelling of 196351821 in words is "one hundred ninety-six million, three hundred fifty-one thousand, eight hundred twenty-one".