1561323 has 8 divisors (see below), whose sum is σ = 2087568. Its totient is φ = 1037984.

The previous prime is 1561303. The next prime is 1561337. The reversal of 1561323 is 3231651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561323 - 2²⁰ = 512747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561323.

It is not an unprimeable number, because it can be changed into a prime (1561303) 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, 1561 + ... + 2357.

It is an arithmetic number, because the mean of its divisors is an integer number (260946).

2^1561323 is an apocalyptic number.

1561323 is a deficient number, since it is larger than the sum of its proper divisors (526245).

1561323 is an equidigital number, since it uses as much as digits as its factorization.

1561323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453.

The product of its digits is 540, while the sum is 21.

The square root of 1561323 is about 1249.5291113055. The cubic root of 1561323 is about 116.0105767209.

Adding to 1561323 its reverse (3231651), we get a palindrome (4792974).

The spelling of 1561323 in words is "one million, five hundred sixty-one thousand, three hundred twenty-three".