2131511536 has 80 divisors (see below), whose sum is σ = 5157527040. Its totient is φ = 829059840.

The previous prime is 2131511509. The next prime is 2131511537. The reversal of 2131511536 is 6351151312.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131511537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020285 + ... + 1022371.

It is an arithmetic number, because the mean of its divisors is an integer number (64469088).

Almost surely, 2^2131511536 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 2131511536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2578763520).

2131511536 is an abundant number, since it is smaller than the sum of its proper divisors (3026015504).

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

2131511536 is a wasteful number, since it uses less digits than its factorization.

2131511536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942 (or 2936 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 2131511536 is about 46168.2957883438. The cubic root of 2131511536 is about 1286.9526322007.

Adding to 2131511536 its reverse (6351151312), we get a palindrome (8482662848).

The spelling of 2131511536 in words is "two billion, one hundred thirty-one million, five hundred eleven thousand, five hundred thirty-six".