16278481 has 2 divisors, whose sum is σ = 16278482. Its totient is φ = 16278480.

The previous prime is 16278463. The next prime is 16278487. The reversal of 16278481 is 18487261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 5683456 = 3255^2 + 2384^2 .

It is a cyclic number.

It is not a de Polignac number, because 16278481 - 2⁹ = 16277969 is a prime.

It is a super-2 number, since 2×16278481² = 529977887334722, 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 16278481.

It is not a weakly prime, because it can be changed into another prime (16278487) 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, 8139240 + 8139241.

It is an arithmetic number, because the mean of its divisors is an integer number (8139241).

Almost surely, 2^16278481 is an apocalyptic number.

It is an amenable number.

16278481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16278481 is an equidigital number, since it uses as much as digits as its factorization.

16278481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 16278481 is about 4034.6599608889. The cubic root of 16278481 is about 253.4377430119.

The spelling of 16278481 in words is "sixteen million, two hundred seventy-eight thousand, four hundred eighty-one".