1561611504 has 40 divisors (see below), whose sum is σ = 4110286032. Its totient is φ = 510714880.

The previous prime is 1561611503. The next prime is 1561611509. The reversal of 1561611504 is 4051161651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561611503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304377 + ... + 309464.

Almost surely, 2^1561611504 is an apocalyptic number.

It is an amenable number.

1561611504 is an abundant number, since it is smaller than the sum of its proper divisors (2548674528).

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

1561611504 is a wasteful number, since it uses less digits than its factorization.

1561611504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613905 (or 613899 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1561611504 is about 39517.2304697584. The cubic root of 1561611504 is about 1160.1772182671.

The spelling of 1561611504 in words is "one billion, five hundred sixty-one million, six hundred eleven thousand, five hundred four".