281028401 has 8 divisors (see below), whose sum is σ = 284101224. Its totient is φ = 277966080.

The previous prime is 281028379. The next prime is 281028409. The reversal of 281028401 is 104820182.

It can be written as a sum of positive squares in 4 ways, for example, as 16120225 + 264908176 = 4015^2 + 16276^2 .

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 281028401 - 2¹⁰ = 281027377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281028409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58835 + ... + 63431.

It is an arithmetic number, because the mean of its divisors is an integer number (35512653).

Almost surely, 2^281028401 is an apocalyptic number.

It is an amenable number.

281028401 is a deficient number, since it is larger than the sum of its proper divisors (3072823).

281028401 is a wasteful number, since it uses less digits than its factorization.

281028401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 281028401 is about 16763.9017236442. The cubic root of 281028401 is about 655.0132281772.

Adding to 281028401 its reverse (104820182), we get a palindrome (385848583).

The spelling of 281028401 in words is "two hundred eighty-one million, twenty-eight thousand, four hundred one".