1363581 has 8 divisors (see below), whose sum is σ = 2020160. Its totient is φ = 909036.

The previous prime is 1363577. The next prime is 1363603. The reversal of 1363581 is 1853631.

It is not a de Polignac number, because 1363581 - 2² = 1363577 is a prime.

It is a super-2 number, since 2×1363581² = 3718706287122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 50503 = 1363581 / (1 + 3 + 6 + 3 + 5 + 8 + 1).

It is a Duffinian number.

1363581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1363511) 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 in 7 ways as a sum of consecutive naturals, for example, 25225 + ... + 25278.

It is an arithmetic number, because the mean of its divisors is an integer number (252520).

2^1363581 is an apocalyptic number.

It is an amenable number.

1363581 is a deficient number, since it is larger than the sum of its proper divisors (656579).

1363581 is an equidigital number, since it uses as much as digits as its factorization.

1363581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50512 (or 50506 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1363581 is about 1167.7247107088. The cubic root of 1363581 is about 110.8903226367.

The spelling of 1363581 in words is "one million, three hundred sixty-three thousand, five hundred eighty-one".