231009197 has 2 divisors, whose sum is σ = 231009198. Its totient is φ = 231009196.

The previous prime is 231009187. The next prime is 231009223. The reversal of 231009197 is 791900132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140873161 + 90136036 = 11869^2 + 9494^2 .

It is a cyclic number.

It is not a de Polignac number, because 231009197 - 2¹² = 231005101 is a prime.

It is a Chen prime.

It is equal to p_12695063 and since 231009197 and 12695063 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231009137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115504598 + 115504599.

It is an arithmetic number, because the mean of its divisors is an integer number (115504599).

Almost surely, 2^231009197 is an apocalyptic number.

It is an amenable number.

231009197 is a deficient number, since it is larger than the sum of its proper divisors (1).

231009197 is an equidigital number, since it uses as much as digits as its factorization.

231009197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 231009197 is about 15198.9867096461. The cubic root of 231009197 is about 613.5873868427.

The spelling of 231009197 in words is "two hundred thirty-one million, nine thousand, one hundred ninety-seven".