2015561024 has 56 divisors (see below), whose sum is σ = 4242133248. Its totient is φ = 948119040.

The previous prime is 2015561011. The next prime is 2015561027. The reversal of 2015561024 is 4201655102.

It is a Cunningham number, because it is equal to 44895²-1.

It is a junction number, because it is equal to n+sod(n) for n = 2015560984 and 2015561002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015561027) 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, 78569 + ... + 101015.

Almost surely, 2^2015561024 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 2015561024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2121066624).

2015561024 is an abundant number, since it is smaller than the sum of its proper divisors (2226572224).

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

2015561024 is a wasteful number, since it uses less digits than its factorization.

2015561024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22543 (or 22533 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2015561024 is about 44894.9999888629. Note that the first 4 decimals coincide. The cubic root of 2015561024 is about 1263.1802220595.

The spelling of 2015561024 in words is "two billion, fifteen million, five hundred sixty-one thousand, twenty-four".