43213731587 has 24 divisors (see below), whose sum is σ = 49465613232. Its totient is φ = 37520985600.

The previous prime is 43213731529. The next prime is 43213731593. The reversal of 43213731587 is 78513731234.

It is a happy number.

It is not a de Polignac number, because 43213731587 - 2⁶ = 43213731523 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43213734587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12099512 + ... + 12103082.

It is an arithmetic number, because the mean of its divisors is an integer number (2061067218).

Almost surely, 2^43213731587 is an apocalyptic number.

43213731587 is a deficient number, since it is larger than the sum of its proper divisors (6251881645).

43213731587 is a wasteful number, since it uses less digits than its factorization.

43213731587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839 (or 6822 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The spelling of 43213731587 in words is "forty-three billion, two hundred thirteen million, seven hundred thirty-one thousand, five hundred eighty-seven".