196555621 has 8 divisors (see below), whose sum is σ = 198833024. Its totient is φ = 194285520.

The previous prime is 196555613. The next prime is 196555637. The reversal of 196555621 is 126555691.

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 196555621 - 2³ = 196555613 is a prime.

It is a super-2 number, since 2×196555621² = 77268224293391282, 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 (196585621) 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 7 ways as a sum of consecutive naturals, for example, 66640 + ... + 69526.

It is an arithmetic number, because the mean of its divisors is an integer number (24854128).

Almost surely, 2^196555621 is an apocalyptic number.

It is an amenable number.

196555621 is a deficient number, since it is larger than the sum of its proper divisors (2277403).

196555621 is a wasteful number, since it uses less digits than its factorization.

196555621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3651.

The product of its digits is 81000, while the sum is 40.

The square root of 196555621 is about 14019.8295638713. The cubic root of 196555621 is about 581.4269472296.

The spelling of 196555621 in words is "one hundred ninety-six million, five hundred fifty-five thousand, six hundred twenty-one".