281421001 has 8 divisors (see below), whose sum is σ = 290501640. Its totient is φ = 272418048.

The previous prime is 281420987. The next prime is 281421011. The reversal of 281421001 is 100124182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 153165376 + 128255625 = 12376^2 + 11325^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 281421001 - 2¹³ = 281412809 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 281421001.

It is not an unprimeable number, because it can be changed into a prime (281421011) 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 7 ways as a sum of consecutive naturals, for example, 12016 + ... + 26593.

It is an arithmetic number, because the mean of its divisors is an integer number (36312705).

Almost surely, 2^281421001 is an apocalyptic number.

It is an amenable number.

281421001 is a deficient number, since it is larger than the sum of its proper divisors (9080639).

281421001 is a wasteful number, since it uses less digits than its factorization.

281421001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38843.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 281421001 is about 16775.6073213461. The cubic root of 281421001 is about 655.3181066572.

Adding to 281421001 its reverse (100124182), we get a palindrome (381545183).

The spelling of 281421001 in words is "two hundred eighty-one million, four hundred twenty-one thousand, one".