2189987533 has 4 divisors (see below), whose sum is σ = 2190874140. Its totient is φ = 2189100928.

The previous prime is 2189987531. The next prime is 2189987537. The reversal of 2189987533 is 3357899812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1832096809 + 357890724 = 42803^2 + 18918^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189987533 - 2¹ = 2189987531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189987531) 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 3 ways as a sum of consecutive naturals, for example, 439588 + ... + 444541.

It is an arithmetic number, because the mean of its divisors is an integer number (547718535).

Almost surely, 2^2189987533 is an apocalyptic number.

It is an amenable number.

2189987533 is a deficient number, since it is larger than the sum of its proper divisors (886607).

2189987533 is an equidigital number, since it uses as much as digits as its factorization.

2189987533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886606.

The product of its digits is 3265920, while the sum is 55.

The square root of 2189987533 is about 46797.3026252582. The cubic root of 2189987533 is about 1298.6153962242.

The spelling of 2189987533 in words is "two billion, one hundred eighty-nine million, nine hundred eighty-seven thousand, five hundred thirty-three".