281606401 has 4 divisors (see below), whose sum is σ = 281960532. Its totient is φ = 281252272.

The previous prime is 281606359. The next prime is 281606417. The reversal of 281606401 is 104606182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143520400 + 138086001 = 11980^2 + 11751^2 .

It is a cyclic number.

It is not a de Polignac number, because 281606401 - 2⁹ = 281605889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 281606401.

It is not an unprimeable number, because it can be changed into a prime (281606431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175870 + ... + 177463.

It is an arithmetic number, because the mean of its divisors is an integer number (70490133).

Almost surely, 2^281606401 is an apocalyptic number.

It is an amenable number.

281606401 is a deficient number, since it is larger than the sum of its proper divisors (354131).

281606401 is an equidigital number, since it uses as much as digits as its factorization.

281606401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354130.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 281606401 is about 16781.1322919522. The cubic root of 281606401 is about 655.4619828022.

The spelling of 281606401 in words is "two hundred eighty-one million, six hundred six thousand, four hundred one".