331666961 has 2 divisors, whose sum is σ = 331666962. Its totient is φ = 331666960.

The previous prime is 331666903. The next prime is 331667003. The reversal of 331666961 is 169666133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330330625 + 1336336 = 18175^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 331666961 - 2⁶ = 331666897 is a prime.

It is a super-2 number, since 2×331666961² = 220005946037951042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331666561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165833480 + 165833481.

It is an arithmetic number, because the mean of its divisors is an integer number (165833481).

Almost surely, 2^331666961 is an apocalyptic number.

It is an amenable number.

331666961 is a deficient number, since it is larger than the sum of its proper divisors (1).

331666961 is an equidigital number, since it uses as much as digits as its factorization.

331666961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 331666961 is about 18211.7259204063. The cubic root of 331666961 is about 692.2039456177.

The spelling of 331666961 in words is "three hundred thirty-one million, six hundred sixty-six thousand, nine hundred sixty-one".