1561113 has 10 divisors (see below), whose sum is σ = 2332154. Its totient is φ = 1040688.

The previous prime is 1561111. The next prime is 1561117. The reversal of 1561113 is 3111651.

It can be written as a sum of positive squares in only one way, i.e., 1411344 + 149769 = 1188^2 + 387^2 .

It is not a de Polignac number, because 1561113 - 2¹ = 1561111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9556 + ... + 9717.

2^1561113 is an apocalyptic number.

It is an amenable number.

1561113 is a deficient number, since it is larger than the sum of its proper divisors (771041).

1561113 is an equidigital number, since it uses as much as digits as its factorization.

1561113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19285 (or 19276 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 1561113 is about 1249.4450768241. The cubic root of 1561113 is about 116.0053752959.

Adding to 1561113 its reverse (3111651), we get a palindrome (4672764).

The spelling of 1561113 in words is "one million, five hundred sixty-one thousand, one hundred thirteen".