2015111540 has 48 divisors (see below), whose sum is σ = 4593211392. Its totient is φ = 738170496.

The previous prime is 2015111533. The next prime is 2015111597. The reversal of 2015111540 is 451115102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 2507 + ... + 63533.

It is an arithmetic number, because the mean of its divisors is an integer number (95691904).

Almost surely, 2^2015111540 is an apocalyptic number.

2015111540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2015111540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2296605696).

2015111540 is an abundant number, since it is smaller than the sum of its proper divisors (2578099852).

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

2015111540 is a wasteful number, since it uses less digits than its factorization.

2015111540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61176 (or 61174 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2015111540 is about 44889.9937625302. The cubic root of 2015111540 is about 1263.0863157801.

Adding to 2015111540 its reverse (451115102), we get a palindrome (2466226642).

The spelling of 2015111540 in words is "two billion, fifteen million, one hundred eleven thousand, five hundred forty".