1325581 has 2 divisors, whose sum is σ = 1325582. Its totient is φ = 1325580.

The previous prime is 1325579. The next prime is 1325617. The reversal of 1325581 is 1855231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 189225 = 1066^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325581 - 2¹ = 1325579 is a prime.

It is a super-2 number, since 2×1325581² = 3514329975122, which contains 22 as substring.

Together with 1325579, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1325501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662790 + 662791.

It is an arithmetic number, because the mean of its divisors is an integer number (662791).

2^1325581 is an apocalyptic number.

It is an amenable number.

1325581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325581 is an equidigital number, since it uses as much as digits as its factorization.

1325581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 1325581 is about 1151.3387859357. The cubic root of 1325581 is about 109.8505131972.

The spelling of 1325581 in words is "one million, three hundred twenty-five thousand, five hundred eighty-one".