196549621 has 4 divisors (see below), whose sum is σ = 196767232. Its totient is φ = 196332012.

The previous prime is 196549609. The next prime is 196549643. The reversal of 196549621 is 126945691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126945691 = 7537 ⋅16843.

It is a cyclic number.

It is not a de Polignac number, because 196549621 - 2¹¹ = 196547573 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 (196549321) 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 3 ways as a sum of consecutive naturals, for example, 107445 + ... + 109258.

It is an arithmetic number, because the mean of its divisors is an integer number (49191808).

Almost surely, 2^196549621 is an apocalyptic number.

It is an amenable number.

196549621 is a deficient number, since it is larger than the sum of its proper divisors (217611).

196549621 is an equidigital number, since it uses as much as digits as its factorization.

196549621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217610.

The product of its digits is 116640, while the sum is 43.

The square root of 196549621 is about 14019.6155796085. The cubic root of 196549621 is about 581.4210310125.

The spelling of 196549621 in words is "one hundred ninety-six million, five hundred forty-nine thousand, six hundred twenty-one".