1561336 has 32 divisors (see below), whose sum is σ = 3420000. Its totient is φ = 667968.

The previous prime is 1561303. The next prime is 1561337. The reversal of 1561336 is 6331651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561336.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2460 + ... + 3028.

It is an arithmetic number, because the mean of its divisors is an integer number (106875).

2^1561336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1710000).

1561336 is an abundant number, since it is smaller than the sum of its proper divisors (1858664).

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

1561336 is an equidigital number, since it uses as much as digits as its factorization.

1561336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 578 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

The square root of 1561336 is about 1249.5343132543. The cubic root of 1561336 is about 116.0108986985.

Adding to 1561336 its reverse (6331651), we get a palindrome (7892987).

The spelling of 1561336 in words is "one million, five hundred sixty-one thousand, three hundred thirty-six".