331808413 has 2 divisors, whose sum is σ = 331808414. Its totient is φ = 331808412.

The previous prime is 331808377. The next prime is 331808437. The reversal of 331808413 is 314808133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177502329 + 154306084 = 13323^2 + 12422^2 .

It is an emirp because it is prime and its reverse (314808133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331808413 - 2²⁵ = 298253981 is a prime.

It is a super-2 number, since 2×331808413² = 220193645875157138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331808443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165904206 + 165904207.

It is an arithmetic number, because the mean of its divisors is an integer number (165904207).

Almost surely, 2^331808413 is an apocalyptic number.

It is an amenable number.

331808413 is a deficient number, since it is larger than the sum of its proper divisors (1).

331808413 is an equidigital number, since it uses as much as digits as its factorization.

331808413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 331808413 is about 18215.6090482860. The cubic root of 331808413 is about 692.3023372049.

The spelling of 331808413 in words is "three hundred thirty-one million, eight hundred eight thousand, four hundred thirteen".