1290581 has 2 divisors, whose sum is σ = 1290582. Its totient is φ = 1290580.

The previous prime is 1290571. The next prime is 1290593. The reversal of 1290581 is 1850921.

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., 970225 + 320356 = 985^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290581 - 2¹⁰ = 1289557 is a prime.

It is a super-2 number, since 2×1290581² = 3331198635122, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1290581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290551) 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 as a sum of consecutive naturals, namely, 645290 + 645291.

It is an arithmetic number, because the mean of its divisors is an integer number (645291).

2^1290581 is an apocalyptic number.

It is an amenable number.

1290581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290581 is an equidigital number, since it uses as much as digits as its factorization.

1290581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1290581 is about 1136.0374113558. The cubic root of 1290581 is about 108.8750637653.

The spelling of 1290581 in words is "one million, two hundred ninety thousand, five hundred eighty-one".