1487581 has 2 divisors, whose sum is σ = 1487582. Its totient is φ = 1487580.

The previous prime is 1487579. The next prime is 1487593. The reversal of 1487581 is 1857841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 210681 = 1130^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 1487581 - 2¹ = 1487579 is a prime.

It is a super-2 number, since 2×1487581² = 4425794463122, which contains 22 as substring.

Together with 1487579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1487081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 743790 + 743791.

It is an arithmetic number, because the mean of its divisors is an integer number (743791).

2^1487581 is an apocalyptic number.

It is an amenable number.

1487581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1487581 is an equidigital number, since it uses as much as digits as its factorization.

1487581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 34.

The square root of 1487581 is about 1219.6642980755. The cubic root of 1487581 is about 114.1546326729.

The spelling of 1487581 in words is "one million, four hundred eighty-seven thousand, five hundred eighty-one".