1561224 has 32 divisors (see below), whose sum is σ = 4461120. Its totient is φ = 446016.

The previous prime is 1561213. The next prime is 1561243. The reversal of 1561224 is 4221651.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1561224.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4479 + ... + 4814.

It is an arithmetic number, because the mean of its divisors is an integer number (139410).

2^1561224 is an apocalyptic number.

1561224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1561224 is an abundant number, since it is smaller than the sum of its proper divisors (2899896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561224 is a wasteful number, since it uses less digits than its factorization.

1561224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309 (or 9305 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 1561224 is about 1249.4894957542. The cubic root of 1561224 is about 116.0081246787.

Adding to 1561224 its reverse (4221651), we get a palindrome (5782875).

The spelling of 1561224 in words is "one million, five hundred sixty-one thousand, two hundred twenty-four".