1561130128 has 80 divisors (see below), whose sum is σ = 3258541440. Its totient is φ = 721963008.

The previous prime is 1561130119. The next prime is 1561130141. The reversal of 1561130128 is 8210311651.

It is a junction number, because it is equal to n+sod(n) for n = 1561130096 and 1561130105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5935725 + ... + 5935987.

It is an arithmetic number, because the mean of its divisors is an integer number (40731768).

Almost surely, 2^1561130128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561130128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1629270720).

1561130128 is an abundant number, since it is smaller than the sum of its proper divisors (1697411312).

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

1561130128 is a wasteful number, since it uses less digits than its factorization.

1561130128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1561130128 is about 39511.1392900787. The cubic root of 1561130128 is about 1160.0579955150.

Adding to 1561130128 its reverse (8210311651), we get a palindrome (9771441779).

The spelling of 1561130128 in words is "one billion, five hundred sixty-one million, one hundred thirty thousand, one hundred twenty-eight".