331864121 has 2 divisors, whose sum is σ = 331864122. Its totient is φ = 331864120.

The previous prime is 331864109. The next prime is 331864151. The reversal of 331864121 is 121468133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 326199721 + 5664400 = 18061^2 + 2380^2 .

It is an emirp because it is prime and its reverse (121468133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331864121 is a prime.

It is a super-2 number, since 2×331864121² = 220267589614205282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331864151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165932060 + 165932061.

It is an arithmetic number, because the mean of its divisors is an integer number (165932061).

Almost surely, 2^331864121 is an apocalyptic number.

It is an amenable number.

331864121 is a deficient number, since it is larger than the sum of its proper divisors (1).

331864121 is an equidigital number, since it uses as much as digits as its factorization.

331864121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 331864121 is about 18217.1381122283. The cubic root of 331864121 is about 692.3410790600.

The spelling of 331864121 in words is "three hundred thirty-one million, eight hundred sixty-four thousand, one hundred twenty-one".