1561303545 has 16 divisors (see below), whose sum is σ = 2645032320. Its totient is φ = 783713024.

The previous prime is 1561303529. The next prime is 1561303547. The reversal of 1561303545 is 5453031651.

It is a cyclic number.

It is not a de Polignac number, because 1561303545 - 2⁴ = 1561303529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561303547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3061125 + ... + 3061634.

It is an arithmetic number, because the mean of its divisors is an integer number (165314520).

Almost surely, 2^1561303545 is an apocalyptic number.

1561303545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561303545 is a deficient number, since it is larger than the sum of its proper divisors (1083728775).

1561303545 is a wasteful number, since it uses less digits than its factorization.

1561303545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122784.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 1561303545 is about 39513.3337621619. Note that the first 3 decimals coincide. The cubic root of 1561303545 is about 1160.1009486563.

The spelling of 1561303545 in words is "one billion, five hundred sixty-one million, three hundred three thousand, five hundred forty-five".