87811543 has 4 divisors (see below), whose sum is σ = 87895368. Its totient is φ = 87727720.

The previous prime is 87811531. The next prime is 87811567. The reversal of 87811543 is 34511878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34511878 = 2 ⋅17255939.

It is a cyclic number.

It is not a de Polignac number, because 87811543 - 2²⁵ = 54257111 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 (87811573) 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, 40321 + ... + 42442.

It is an arithmetic number, because the mean of its divisors is an integer number (21973842).

Almost surely, 2^87811543 is an apocalyptic number.

87811543 is a deficient number, since it is larger than the sum of its proper divisors (83825).

87811543 is a wasteful number, since it uses less digits than its factorization.

87811543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83824.

The product of its digits is 26880, while the sum is 37.

The square root of 87811543 is about 9370.7813441570. The cubic root of 87811543 is about 444.4782725340.

It can be divided in two parts, 878 and 11543, that added together give a palindrome (12421).

The spelling of 87811543 in words is "eighty-seven million, eight hundred eleven thousand, five hundred forty-three".