196861109 has 4 divisors (see below), whose sum is σ = 207222240. Its totient is φ = 186499980.

The previous prime is 196861099. The next prime is 196861141. The reversal of 196861109 is 901168691.

It is a happy number.

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: 901168691 = 17 ⋅53009923.

It is a cyclic number.

It is not a de Polignac number, because 196861109 - 2¹² = 196857013 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 (196861169) 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, 5180537 + ... + 5180574.

It is an arithmetic number, because the mean of its divisors is an integer number (51805560).

Almost surely, 2^196861109 is an apocalyptic number.

196861109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

196861109 is a deficient number, since it is larger than the sum of its proper divisors (10361131).

196861109 is a wasteful number, since it uses less digits than its factorization.

196861109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10361130.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 196861109 is about 14030.7201882156. The cubic root of 196861109 is about 581.7280104687.

The spelling of 196861109 in words is "one hundred ninety-six million, eight hundred sixty-one thousand, one hundred nine".