1223581 has 4 divisors (see below), whose sum is σ = 1288000. Its totient is φ = 1159164.

The previous prime is 1223569. The next prime is 1223587. The reversal of 1223581 is 1853221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1853221 = 17 ⋅109013.

It is a cyclic number.

It is not a de Polignac number, because 1223581 - 2⁵ = 1223549 is a prime.

It is a super-2 number, since 2×1223581² = 2994300927122, 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 (1223587) 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, 32181 + ... + 32218.

It is an arithmetic number, because the mean of its divisors is an integer number (322000).

2^1223581 is an apocalyptic number.

It is an amenable number.

1223581 is a deficient number, since it is larger than the sum of its proper divisors (64419).

1223581 is an equidigital number, since it uses as much as digits as its factorization.

1223581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64418.

The product of its digits is 480, while the sum is 22.

The square root of 1223581 is about 1106.1559564546. The cubic root of 1223581 is about 106.9574174751.

The spelling of 1223581 in words is "one million, two hundred twenty-three thousand, five hundred eighty-one".