1581223 has 4 divisors (see below), whose sum is σ = 1807120. Its totient is φ = 1355328.

The previous prime is 1581211. The next prime is 1581257. The reversal of 1581223 is 3221851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3221851 = 659 ⋅4889.

It is a cyclic number.

It is not a de Polignac number, because 1581223 - 2⁵ = 1581191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1581194 and 1581203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581623) 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, 112938 + ... + 112951.

It is an arithmetic number, because the mean of its divisors is an integer number (451780).

2^1581223 is an apocalyptic number.

1581223 is a deficient number, since it is larger than the sum of its proper divisors (225897).

1581223 is an equidigital number, since it uses as much as digits as its factorization.

1581223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225896.

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

The square root of 1581223 is about 1257.4668981727. The cubic root of 1581223 is about 116.5013722692.

The spelling of 1581223 in words is "one million, five hundred eighty-one thousand, two hundred twenty-three".