196312891 has 2 divisors, whose sum is σ = 196312892. Its totient is φ = 196312890.

The previous prime is 196312877. The next prime is 196312933. The reversal of 196312891 is 198213691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 196312891 - 2¹⁹ = 195788603 is a prime.

It is not a weakly prime, because it can be changed into another prime (196312591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98156445 + 98156446.

It is an arithmetic number, because the mean of its divisors is an integer number (98156446).

Almost surely, 2^196312891 is an apocalyptic number.

196312891 is a deficient number, since it is larger than the sum of its proper divisors (1).

196312891 is an equidigital number, since it uses as much as digits as its factorization.

196312891 is an evil number, because the sum of its binary digits is even.

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

The square root of 196312891 is about 14011.1702223619. The cubic root of 196312891 is about 581.1875105134.

It can be divided in two parts, 19631 and 2891, that added together give a palindrome (22522).

The spelling of 196312891 in words is "one hundred ninety-six million, three hundred twelve thousand, eight hundred ninety-one".