197318213 has 4 divisors (see below), whose sum is σ = 197991948. Its totient is φ = 196644480.

The previous prime is 197318203. The next prime is 197318237. The reversal of 197318213 is 312813791.

It is a happy number.

197318213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312813791 = 53 ⋅5902147.

It can be written as a sum of positive squares in 2 ways, for example, as 186677569 + 10640644 = 13663^2 + 3262^2 .

It is a cyclic number.

It is not a de Polignac number, because 197318213 - 2¹⁶ = 197252677 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 (197318203) 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, 336428 + ... + 337013.

It is an arithmetic number, because the mean of its divisors is an integer number (49497987).

Almost surely, 2^197318213 is an apocalyptic number.

It is an amenable number.

197318213 is a deficient number, since it is larger than the sum of its proper divisors (673735).

197318213 is an equidigital number, since it uses as much as digits as its factorization.

197318213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673734.

The product of its digits is 9072, while the sum is 35.

The square root of 197318213 is about 14047.0001423792. Note that the first 3 decimals coincide. The cubic root of 197318213 is about 582.1779125271.

The spelling of 197318213 in words is "one hundred ninety-seven million, three hundred eighteen thousand, two hundred thirteen".