231020197 has 2 divisors, whose sum is σ = 231020198. Its totient is φ = 231020196.

The previous prime is 231020189. The next prime is 231020233. The reversal of 231020197 is 791020132.

231020197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225780676 + 5239521 = 15026^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 231020197 - 2³ = 231020189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231620197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510098 + 115510099.

It is an arithmetic number, because the mean of its divisors is an integer number (115510099).

Almost surely, 2^231020197 is an apocalyptic number.

It is an amenable number.

231020197 is a deficient number, since it is larger than the sum of its proper divisors (1).

231020197 is an equidigital number, since it uses as much as digits as its factorization.

231020197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 231020197 is about 15199.3485715671. The cubic root of 231020197 is about 613.5971257827.

The spelling of 231020197 in words is "two hundred thirty-one million, twenty thousand, one hundred ninety-seven".