331780433 has 2 divisors, whose sum is σ = 331780434. Its totient is φ = 331780432.

The previous prime is 331780429. The next prime is 331780441. The reversal of 331780433 is 334087133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205262929 + 126517504 = 14327^2 + 11248^2 .

It is a cyclic number.

It is not a de Polignac number, because 331780433 - 2² = 331780429 is a prime.

It is a super-2 number, since 2×331780433² = 220156511443334978, 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 331780433.

It is not a weakly prime, because it can be changed into another prime (331780453) 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, 165890216 + 165890217.

It is an arithmetic number, because the mean of its divisors is an integer number (165890217).

Almost surely, 2^331780433 is an apocalyptic number.

It is an amenable number.

331780433 is a deficient number, since it is larger than the sum of its proper divisors (1).

331780433 is an equidigital number, since it uses as much as digits as its factorization.

331780433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 331780433 is about 18214.8410094626. The cubic root of 331780433 is about 692.2828770152.

The spelling of 331780433 in words is "three hundred thirty-one million, seven hundred eighty thousand, four hundred thirty-three".