2151581484 has 96 divisors (see below), whose sum is σ = 5479344640. Its totient is φ = 653184000.

The previous prime is 2151581479. The next prime is 2151581491. The reversal of 2151581484 is 4841851512.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5676807 + ... + 5677185.

Almost surely, 2^2151581484 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 2151581484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2739672320).

2151581484 is an abundant number, since it is smaller than the sum of its proper divisors (3327763156).

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

2151581484 is a wasteful number, since it uses less digits than its factorization.

2151581484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 789 counting only the distinct ones).

The product of its digits is 51200, while the sum is 39.

The square root of 2151581484 is about 46385.1429231387. The cubic root of 2151581484 is about 1290.9792624452.

The spelling of 2151581484 in words is "two billion, one hundred fifty-one million, five hundred eighty-one thousand, four hundred eighty-four".