1561107 has 4 divisors (see below), whose sum is σ = 2081480. Its totient is φ = 1040736.

The previous prime is 1561069. The next prime is 1561111. The reversal of 1561107 is 7011651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7011651 = 3 ⋅2337217.

It is not a de Polignac number, because 1561107 - 2¹¹ = 1559059 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561117) 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 3 ways as a sum of consecutive naturals, for example, 260182 + ... + 260187.

It is an arithmetic number, because the mean of its divisors is an integer number (520370).

2^1561107 is an apocalyptic number.

1561107 is a deficient number, since it is larger than the sum of its proper divisors (520373).

1561107 is an equidigital number, since it uses as much as digits as its factorization.

1561107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520372.

The product of its (nonzero) digits is 210, while the sum is 21.

The square root of 1561107 is about 1249.4426757559. The cubic root of 1561107 is about 116.0052266769.

Adding to 1561107 its reverse (7011651), we get a palindrome (8572758).

The spelling of 1561107 in words is "one million, five hundred sixty-one thousand, one hundred seven".