1128581 has 4 divisors (see below), whose sum is σ = 1188000. Its totient is φ = 1069164.

The previous prime is 1128577. The next prime is 1128583. The reversal of 1128581 is 1858211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1128581 - 2² = 1128577 is a prime.

It is a super-2 number, since 2×1128581² = 2547390147122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29681 + ... + 29718.

It is an arithmetic number, because the mean of its divisors is an integer number (297000).

2^1128581 is an apocalyptic number.

It is an amenable number.

1128581 is a deficient number, since it is larger than the sum of its proper divisors (59419).

1128581 is an equidigital number, since it uses as much as digits as its factorization.

1128581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59418.

The product of its digits is 640, while the sum is 26.

The square root of 1128581 is about 1062.3469301504. The cubic root of 1128581 is about 104.1144265702.

The spelling of 1128581 in words is "one million, one hundred twenty-eight thousand, five hundred eighty-one".