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1000281 = 3333427

1000281 has 4 divisors (see below), whose sum is σ = 1333712. Its totient is φ = 666852.

The previous prime is 1000273. The next prime is 1000289. The reversal of 1000281 is 1820001.

Adding to 1000281 its reverse (1820001), we get a palindrome (2820282).

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1000273) and next prime (1000289).

It is not a de Polignac number, because 1000281 - 23 = 1000273 is a prime.

It is a super-2 number, since 2×10002812 = 2001124157922, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

1000281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1000289) 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, 166711 + ... + 166716.

It is an arithmetic number, because the mean of its divisors is an integer number (333428).

21000281 is an apocalyptic number.

It is an amenable number.

1000281 is a deficient number, since it is larger than the sum of its proper divisors (333431).

1000281 is an equidigital number, since it uses as much as digits as its factorization.

1000281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333430.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1000281 is about 1000.1404901313. The cubic root of 1000281 is about 100.0093657895.

The spelling of 1000281 in words is "one million, two hundred eighty-one", and thus it is an aban number.

Divisors: 1 3 333427 1000281