2143551540 has 96 divisors (see below), whose sum is σ = 6526630656. Its totient is φ = 522501120.

The previous prime is 2143551511. The next prime is 2143551547. The reversal of 2143551540 is 451553412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2143551498 and 2143551507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143551547) by changing a digit.

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, 67000 + ... + 93680.

It is an arithmetic number, because the mean of its divisors is an integer number (67985736).

Almost surely, 2^2143551540 is an apocalyptic number.

2143551540 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 2143551540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3263315328).

2143551540 is an abundant number, since it is smaller than the sum of its proper divisors (4383079116).

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

2143551540 is a wasteful number, since it uses less digits than its factorization.

2143551540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26809 (or 26807 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 2143551540 is about 46298.5047274747. The cubic root of 2143551540 is about 1289.3712337511.

The spelling of 2143551540 in words is "two billion, one hundred forty-three million, five hundred fifty-one thousand, five hundred forty".