1561560516 has 36 divisors (see below), whose sum is σ = 3949208172. Its totient is φ = 520265664.

The previous prime is 1561560463. The next prime is 1561560529. The reversal of 1561560516 is 6150651651.

It can be written as a sum of positive squares in 2 ways, for example, as 869660100 + 691900416 = 29490^2 + 26304^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73090 + ... + 92006.

It is an arithmetic number, because the mean of its divisors is an integer number (109700227).

Almost surely, 2^1561560516 is an apocalyptic number.

It is an amenable number.

1561560516 is an abundant number, since it is smaller than the sum of its proper divisors (2387647656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561560516 is a wasteful number, since it uses less digits than its factorization.

1561560516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21220 (or 21215 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1561560516 is about 39516.5853281885. The cubic root of 1561560516 is about 1160.1645911914.

The spelling of 1561560516 in words is "one billion, five hundred sixty-one million, five hundred sixty thousand, five hundred sixteen".