1561326 has 32 divisors (see below), whose sum is σ = 3460128. Its totient is φ = 466560.

The previous prime is 1561303. The next prime is 1561337. The reversal of 1561326 is 6231651.

It is a junction number, because it is equal to n+sod(n) for n = 1561296 and 1561305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2616 + ... + 3156.

It is an arithmetic number, because the mean of its divisors is an integer number (108129).

2^1561326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730064).

1561326 is an abundant number, since it is smaller than the sum of its proper divisors (1898802).

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

1561326 is a wasteful number, since it uses less digits than its factorization.

1561326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its digits is 1080, while the sum is 24.

The square root of 1561326 is about 1249.5303117572. The cubic root of 1561326 is about 116.0106510236.

Adding to 1561326 its reverse (6231651), we get a palindrome (7792977).

The spelling of 1561326 in words is "one million, five hundred sixty-one thousand, three hundred twenty-six".