213422897 has 2 divisors, whose sum is σ = 213422898. Its totient is φ = 213422896.

The previous prime is 213422863. The next prime is 213422899. The reversal of 213422897 is 798224312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213422881 + 16 = 14609^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213422897 is a prime.

Together with 213422899, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213422897.

It is not a weakly prime, because it can be changed into another prime (213422899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106711448 + 106711449.

It is an arithmetic number, because the mean of its divisors is an integer number (106711449).

Almost surely, 2^213422897 is an apocalyptic number.

It is an amenable number.

213422897 is a deficient number, since it is larger than the sum of its proper divisors (1).

213422897 is an equidigital number, since it uses as much as digits as its factorization.

213422897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 213422897 is about 14609.0005476076. Note that the first 3 decimals coincide. The cubic root of 213422897 is about 597.6042401420.

The spelling of 213422897 in words is "two hundred thirteen million, four hundred twenty-two thousand, eight hundred ninety-seven".