196213891 has 4 divisors (see below), whose sum is σ = 196371000. Its totient is φ = 196056784.

The previous prime is 196213889. The next prime is 196213907. The reversal of 196213891 is 198312691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198312691 = 1303 ⋅152197.

It is a cyclic number.

It is not a de Polignac number, because 196213891 - 2¹ = 196213889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196213691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76666 + ... + 79183.

It is an arithmetic number, because the mean of its divisors is an integer number (49092750).

Almost surely, 2^196213891 is an apocalyptic number.

196213891 is a deficient number, since it is larger than the sum of its proper divisors (157109).

196213891 is a wasteful number, since it uses less digits than its factorization.

196213891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157108.

The product of its digits is 23328, while the sum is 40.

The square root of 196213891 is about 14007.6368813587. The cubic root of 196213891 is about 581.0897970486.

The spelling of 196213891 in words is "one hundred ninety-six million, two hundred thirteen thousand, eight hundred ninety-one".