1871281 has 4 divisors (see below), whose sum is σ = 1916964. Its totient is φ = 1825600.

The previous prime is 1871279. The next prime is 1871293. The reversal of 1871281 is 1821781.

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 409600 + 1461681 = 640^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871281 - 2¹ = 1871279 is a prime.

It is a super-2 number, since 2×1871281² = 7003385161922, which contains 22 as substring.

It is a Duffinian number.

1871281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1871081) 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, 22780 + ... + 22861.

It is an arithmetic number, because the mean of its divisors is an integer number (479241).

2^1871281 is an apocalyptic number.

It is an amenable number.

1871281 is a deficient number, since it is larger than the sum of its proper divisors (45683).

1871281 is an equidigital number, since it uses as much as digits as its factorization.

1871281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45682.

The product of its digits is 896, while the sum is 28.

The square root of 1871281 is about 1367.9477329196. The cubic root of 1871281 is about 123.2290222640.

The spelling of 1871281 in words is "one million, eight hundred seventy-one thousand, two hundred eighty-one".