331661233 has 2 divisors, whose sum is σ = 331661234. Its totient is φ = 331661232.

The previous prime is 331661191. The next prime is 331661237. The reversal of 331661233 is 332166133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191877904 + 139783329 = 13852^2 + 11823^2 .

It is a cyclic number.

It is not a de Polignac number, because 331661233 - 2¹³ = 331653041 is a prime.

It is not a weakly prime, because it can be changed into another prime (331661237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165830616 + 165830617.

It is an arithmetic number, because the mean of its divisors is an integer number (165830617).

Almost surely, 2^331661233 is an apocalyptic number.

It is an amenable number.

331661233 is a deficient number, since it is larger than the sum of its proper divisors (1).

331661233 is an equidigital number, since it uses as much as digits as its factorization.

331661233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 28.

The square root of 331661233 is about 18211.5686584105. The cubic root of 331661233 is about 692.1999607297.

The spelling of 331661233 in words is "three hundred thirty-one million, six hundred sixty-one thousand, two hundred thirty-three".