1284581 has 4 divisors (see below), whose sum is σ = 1302252. Its totient is φ = 1266912.

The previous prime is 1284559. The next prime is 1284583. The reversal of 1284581 is 1854821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1854821 = 1093 ⋅1697.

It can be written as a sum of positive squares in 2 ways, for example, as 302500 + 982081 = 550^2 + 991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1284581 is a prime.

It is a super-2 number, since 2×1284581² = 3300296691122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284583) 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, 8726 + ... + 8871.

It is an arithmetic number, because the mean of its divisors is an integer number (325563).

2^1284581 is an apocalyptic number.

It is an amenable number.

1284581 is a deficient number, since it is larger than the sum of its proper divisors (17671).

1284581 is an equidigital number, since it uses as much as digits as its factorization.

1284581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17670.

The product of its digits is 2560, while the sum is 29.

The square root of 1284581 is about 1133.3935768302. The cubic root of 1284581 is about 108.7060790624.

The spelling of 1284581 in words is "one million, two hundred eighty-four thousand, five hundred eighty-one".