2151731736 has 256 divisors, whose sum is σ = 7595596800. Its totient is φ = 548121600.

The previous prime is 2151731677. The next prime is 2151731737. The reversal of 2151731736 is 6371371512.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2151731736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151731737) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 880276 + ... + 882716.

It is an arithmetic number, because the mean of its divisors is an integer number (29670300).

Almost surely, 2^2151731736 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 2151731736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3797798400).

2151731736 is an abundant number, since it is smaller than the sum of its proper divisors (5443865064).

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

2151731736 is a wasteful number, since it uses less digits than its factorization.

2151731736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527 (or 2517 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 2151731736 is about 46386.7625082846. The cubic root of 2151731736 is about 1291.0093128527.

The spelling of 2151731736 in words is "two billion, one hundred fifty-one million, seven hundred thirty-one thousand, seven hundred thirty-six".