1322581 has 4 divisors (see below), whose sum is σ = 1424332. Its totient is φ = 1220832.

The previous prime is 1322579. The next prime is 1322591. The reversal of 1322581 is 1852231.

It is the 470-th star number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1852231 = 317 ⋅5843.

It can be written as a sum of positive squares in 2 ways, for example, as 188356 + 1134225 = 434^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1322581 - 2¹ = 1322579 is a prime.

It is a super-2 number, since 2×1322581² = 3498441003122, which contains 22 as substring.

It is an Ulam number.

1322581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1322501) 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, 50856 + ... + 50881.

It is an arithmetic number, because the mean of its divisors is an integer number (356083).

2^1322581 is an apocalyptic number.

It is an amenable number.

1322581 is a deficient number, since it is larger than the sum of its proper divisors (101751).

1322581 is a wasteful number, since it uses less digits than its factorization.

1322581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101750.

The product of its digits is 480, while the sum is 22.

The square root of 1322581 is about 1150.0352168521. The cubic root of 1322581 is about 109.7675808927.

It can be divided in two parts, 13225 and 81, that multiplied together give a square (1071225 = 1035²).

The spelling of 1322581 in words is "one million, three hundred twenty-two thousand, five hundred eighty-one".