331920833 has 2 divisors, whose sum is σ = 331920834. Its totient is φ = 331920832.

The previous prime is 331920817. The next prime is 331920839. The reversal of 331920833 is 338029133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199854769 + 132066064 = 14137^2 + 11492^2 .

It is a cyclic number.

It is not a de Polignac number, because 331920833 - 2⁴ = 331920817 is a prime.

It is a super-2 number, since 2×331920833² = 220342878758827778, 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 331920833.

It is not a weakly prime, because it can be changed into another prime (331920839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165960416 + 165960417.

It is an arithmetic number, because the mean of its divisors is an integer number (165960417).

Almost surely, 2^331920833 is an apocalyptic number.

It is an amenable number.

331920833 is a deficient number, since it is larger than the sum of its proper divisors (1).

331920833 is an equidigital number, since it uses as much as digits as its factorization.

331920833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 331920833 is about 18218.6946019741. The cubic root of 331920833 is about 692.3805146889.

Adding to 331920833 its reverse (338029133), we get a palindrome (669949966).

The spelling of 331920833 in words is "three hundred thirty-one million, nine hundred twenty thousand, eight hundred thirty-three".