1145581 has 4 divisors (see below), whose sum is σ = 1173564. Its totient is φ = 1117600.

The previous prime is 1145539. The next prime is 1145593. The reversal of 1145581 is 1855411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 885481 = 510^2 + 941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1145581 is a prime.

It is a super-2 number, since 2×1145581² = 2624711655122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145281) 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 3 ways as a sum of consecutive naturals, for example, 13930 + ... + 14011.

It is an arithmetic number, because the mean of its divisors is an integer number (293391).

2^1145581 is an apocalyptic number.

It is an amenable number.

1145581 is a deficient number, since it is larger than the sum of its proper divisors (27983).

1145581 is an equidigital number, since it uses as much as digits as its factorization.

1145581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27982.

The product of its digits is 800, while the sum is 25.

The square root of 1145581 is about 1070.3181769922. The cubic root of 1145581 is about 104.6345876963.

The spelling of 1145581 in words is "one million, one hundred forty-five thousand, five hundred eighty-one".