87531443 has 4 divisors (see below), whose sum is σ = 87677688. Its totient is φ = 87385200.

The previous prime is 87531421. The next prime is 87531463. The reversal of 87531443 is 34413578.

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

It is a cyclic number.

It is not a de Polignac number, because 87531443 - 2¹² = 87527347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87531403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72221 + ... + 73422.

It is an arithmetic number, because the mean of its divisors is an integer number (21919422).

Almost surely, 2^87531443 is an apocalyptic number.

87531443 is a deficient number, since it is larger than the sum of its proper divisors (146245).

87531443 is a wasteful number, since it uses less digits than its factorization.

87531443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146244.

The product of its digits is 40320, while the sum is 35.

The square root of 87531443 is about 9355.8240150187. The cubic root of 87531443 is about 444.0051723419.

The spelling of 87531443 in words is "eighty-seven million, five hundred thirty-one thousand, four hundred forty-three".