331666249 has 2 divisors, whose sum is σ = 331666250. Its totient is φ = 331666248.

The previous prime is 331666219. The next prime is 331666259. The reversal of 331666249 is 942666133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183873600 + 147792649 = 13560^2 + 12157^2 .

It is a cyclic number.

It is not a de Polignac number, because 331666249 - 2¹⁹ = 331141961 is a prime.

It is a super-2 number, since 2×331666249² = 220005001451460002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331666219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165833124 + 165833125.

It is an arithmetic number, because the mean of its divisors is an integer number (165833125).

Almost surely, 2^331666249 is an apocalyptic number.

It is an amenable number.

331666249 is a deficient number, since it is larger than the sum of its proper divisors (1).

331666249 is an equidigital number, since it uses as much as digits as its factorization.

331666249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 331666249 is about 18211.7063725506. The cubic root of 331666249 is about 692.2034502919.

The spelling of 331666249 in words is "three hundred thirty-one million, six hundred sixty-six thousand, two hundred forty-nine".