331666897 has 2 divisors, whose sum is σ = 331666898. Its totient is φ = 331666896.

The previous prime is 331666847. The next prime is 331666903. The reversal of 331666897 is 798666133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323424256 + 8242641 = 17984^2 + 2871^2 .

It is a cyclic number.

It is not a de Polignac number, because 331666897 - 2¹⁵ = 331634129 is a prime.

It is a super-2 number, since 2×331666897² = 220005861131217218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331666897.

It is not a weakly prime, because it can be changed into another prime (331666847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165833448 + 165833449.

It is an arithmetic number, because the mean of its divisors is an integer number (165833449).

Almost surely, 2^331666897 is an apocalyptic number.

It is an amenable number.

331666897 is a deficient number, since it is larger than the sum of its proper divisors (1).

331666897 is an equidigital number, since it uses as much as digits as its factorization.

331666897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 331666897 is about 18211.7241632966. The cubic root of 331666897 is about 692.2039010940.

The spelling of 331666897 in words is "three hundred thirty-one million, six hundred sixty-six thousand, eight hundred ninety-seven".