231666697 has 2 divisors, whose sum is σ = 231666698. Its totient is φ = 231666696.

The previous prime is 231666653. The next prime is 231666707. The reversal of 231666697 is 796666132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223233481 + 8433216 = 14941^2 + 2904^2 .

It is a cyclic number.

It is not a de Polignac number, because 231666697 - 2¹⁵ = 231633929 is a prime.

It is not a weakly prime, because it can be changed into another prime (231666647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115833348 + 115833349.

It is an arithmetic number, because the mean of its divisors is an integer number (115833349).

Almost surely, 2^231666697 is an apocalyptic number.

It is an amenable number.

231666697 is a deficient number, since it is larger than the sum of its proper divisors (1).

231666697 is an equidigital number, since it uses as much as digits as its factorization.

231666697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 231666697 is about 15220.6010722310. The cubic root of 231666697 is about 614.1689676689.

The spelling of 231666697 in words is "two hundred thirty-one million, six hundred sixty-six thousand, six hundred ninety-seven".