1561003688 has 16 divisors (see below), whose sum is σ = 2927356980. Its totient is φ = 780375168.

The previous prime is 1561003681. The next prime is 1561003711. The reversal of 1561003688 is 8863001651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1198405924 + 362597764 = 34618^2 + 19042^2 .

It is not an unprimeable number, because it can be changed into a prime (1561003681) 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 3 ways as a sum of consecutive naturals, for example, 55370 + ... + 78662.

Almost surely, 2^1561003688 is an apocalyptic number.

It is an amenable number.

1561003688 is a deficient number, since it is larger than the sum of its proper divisors (1366353292).

1561003688 is a wasteful number, since it uses less digits than its factorization.

1561003688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31676 (or 31672 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1561003688 is about 39509.5392025774. The cubic root of 1561003688 is about 1160.0266759620.

The spelling of 1561003688 in words is "one billion, five hundred sixty-one million, three thousand, six hundred eighty-eight".