1561316603 has 12 divisors (see below), whose sum is σ = 1961324400. Its totient is φ = 1216609680.

The previous prime is 1561316599. The next prime is 1561316623. The reversal of 1561316603 is 3066131651.

It is not a de Polignac number, because 1561316603 - 2² = 1561316599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561316603.

It is not an unprimeable number, because it can be changed into a prime (1561316623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 920828 + ... + 922521.

It is an arithmetic number, because the mean of its divisors is an integer number (163443700).

Almost surely, 2^1561316603 is an apocalyptic number.

1561316603 is a deficient number, since it is larger than the sum of its proper divisors (400007797).

1561316603 is a wasteful number, since it uses less digits than its factorization.

1561316603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843378 (or 1843367 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 1561316603 is about 39513.4989971782. The cubic root of 1561316603 is about 1160.1041828247.

The spelling of 1561316603 in words is "one billion, five hundred sixty-one million, three hundred sixteen thousand, six hundred three".