1228581 has 8 divisors (see below), whose sum is σ = 1820160. Its totient is φ = 819036.

The previous prime is 1228571. The next prime is 1228583. The reversal of 1228581 is 1858221.

It is a de Polignac number, because none of the positive numbers 2^k-1228581 is a prime.

It is a super-2 number, since 2×1228581² = 3018822547122, 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: 45503 = 1228581 / (1 + 2 + 2 + 8 + 5 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22725 + ... + 22778.

It is an arithmetic number, because the mean of its divisors is an integer number (227520).

2^1228581 is an apocalyptic number.

It is an amenable number.

1228581 is a deficient number, since it is larger than the sum of its proper divisors (591579).

1228581 is an equidigital number, since it uses as much as digits as its factorization.

1228581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45512 (or 45506 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1228581 is about 1108.4137314198. The cubic root of 1228581 is about 107.1029085354.

The spelling of 1228581 in words is "one million, two hundred twenty-eight thousand, five hundred eighty-one".