87101521 has 8 divisors (see below), whose sum is σ = 94346280. Its totient is φ = 79934592.

The previous prime is 87101519. The next prime is 87101543. The reversal of 87101521 is 12510178.

It can be written as a sum of positive squares in 4 ways, for example, as 1742400 + 85359121 = 1320^2 + 9239^2 .

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 87101521 - 2¹ = 87101519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87101561) 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, 17116 + ... + 21613.

It is an arithmetic number, because the mean of its divisors is an integer number (11793285).

Almost surely, 2^87101521 is an apocalyptic number.

It is an amenable number.

87101521 is a deficient number, since it is larger than the sum of its proper divisors (7244759).

87101521 is a wasteful number, since it uses less digits than its factorization.

87101521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38915.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 87101521 is about 9332.8195632403. The cubic root of 87101521 is about 443.2770493430.

Adding to 87101521 its reverse (12510178), we get a palindrome (99611699).

The spelling of 87101521 in words is "eighty-seven million, one hundred one thousand, five hundred twenty-one".