87055571 has 4 divisors (see below), whose sum is σ = 87102144. Its totient is φ = 87009000.

The previous prime is 87055567. The next prime is 87055583. The reversal of 87055571 is 17555078.

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 87055571 - 2² = 87055567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87055531) 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, 20360 + ... + 24261.

It is an arithmetic number, because the mean of its divisors is an integer number (21775536).

Almost surely, 2^87055571 is an apocalyptic number.

87055571 is a deficient number, since it is larger than the sum of its proper divisors (46573).

87055571 is a wasteful number, since it uses less digits than its factorization.

87055571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46572.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 87055571 is about 9330.3574958305. The cubic root of 87055571 is about 443.1990860537.

The spelling of 87055571 in words is "eighty-seven million, fifty-five thousand, five hundred seventy-one".