87056521 has 8 divisors (see below), whose sum is σ = 90163080. Its totient is φ = 83956992.

The previous prime is 87056509. The next prime is 87056531. The reversal of 87056521 is 12565078.

It can be written as a sum of positive squares in 4 ways, for example, as 6056521 + 81000000 = 2461^2 + 9000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87056521 - 2⁷ = 87056393 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87056531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44071 + ... + 46003.

It is an arithmetic number, because the mean of its divisors is an integer number (11270385).

Almost surely, 2^87056521 is an apocalyptic number.

It is an amenable number.

87056521 is a deficient number, since it is larger than the sum of its proper divisors (3106559).

87056521 is a wasteful number, since it uses less digits than its factorization.

87056521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3515.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 87056521 is about 9330.4084047806. The cubic root of 87056521 is about 443.2006981948.

The spelling of 87056521 in words is "eighty-seven million, fifty-six thousand, five hundred twenty-one".