1329281 has 4 divisors (see below), whose sum is σ = 1407492. Its totient is φ = 1251072.

The previous prime is 1329277. The next prime is 1329283. The reversal of 1329281 is 1829231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1829231 = 521 ⋅3511.

It can be written as a sum of positive squares in 2 ways, for example, as 409600 + 919681 = 640^2 + 959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1329281 - 2² = 1329277 is a prime.

It is a super-2 number, since 2×1329281² = 3533975953922, which contains 22 as substring.

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 1329281.

It is not an unprimeable number, because it can be changed into a prime (1329283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39080 + ... + 39113.

It is an arithmetic number, because the mean of its divisors is an integer number (351873).

2^1329281 is an apocalyptic number.

It is an amenable number.

1329281 is a deficient number, since it is larger than the sum of its proper divisors (78211).

1329281 is an equidigital number, since it uses as much as digits as its factorization.

1329281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78210.

The product of its digits is 864, while the sum is 26.

The square root of 1329281 is about 1152.9444912918. The cubic root of 1329281 is about 109.9526242268.

The spelling of 1329281 in words is "one million, three hundred twenty-nine thousand, two hundred eighty-one".