1561688 has 16 divisors (see below), whose sum is σ = 3100680. Its totient is φ = 734848.

The previous prime is 1561673. The next prime is 1561697. The reversal of 1561688 is 8861651.

It is a congruent number.

It is an unprimeable number.

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, 5606 + ... + 5877.

2^1561688 is an apocalyptic number.

It is an amenable number.

1561688 is a deficient number, since it is larger than the sum of its proper divisors (1538992).

1561688 is a wasteful number, since it uses less digits than its factorization.

1561688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11506 (or 11502 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

The square root of 1561688 is about 1249.6751577910. The cubic root of 1561688 is about 116.0196161832.

The spelling of 1561688 in words is "one million, five hundred sixty-one thousand, six hundred eighty-eight".