16304381 has 2 divisors, whose sum is σ = 16304382. Its totient is φ = 16304380.

The previous prime is 16304363. The next prime is 16304399. The reversal of 16304381 is 18340361.

It is a balanced prime because it is at equal distance from previous prime (16304363) and next prime (16304399).

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 5480281 = 3290^2 + 2341^2 .

It is a cyclic number.

It is not a de Polignac number, because 16304381 - 2⁶ = 16304317 is a prime.

It is a super-2 number, since 2×16304381² = 531665679586322, which contains 22 as substring.

It is equal to p_1049444 and since 16304381 and 1049444 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16304381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16303381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8152190 + 8152191.

It is an arithmetic number, because the mean of its divisors is an integer number (8152191).

Almost surely, 2^16304381 is an apocalyptic number.

It is an amenable number.

16304381 is a deficient number, since it is larger than the sum of its proper divisors (1).

16304381 is an equidigital number, since it uses as much as digits as its factorization.

16304381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 16304381 is about 4037.8683732881. The cubic root of 16304381 is about 253.5720831337.

The spelling of 16304381 in words is "sixteen million, three hundred four thousand, three hundred eighty-one".