87515121 has 8 divisors (see below), whose sum is σ = 122828320. Its totient is φ = 55272672.

The previous prime is 87515063. The next prime is 87515123. The reversal of 87515121 is 12151578.

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

It is not a de Polignac number, because 87515121 - 2¹⁴ = 87498737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87515123) 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, 767620 + ... + 767733.

It is an arithmetic number, because the mean of its divisors is an integer number (15353540).

Almost surely, 2^87515121 is an apocalyptic number.

It is an amenable number.

87515121 is a deficient number, since it is larger than the sum of its proper divisors (35313199).

87515121 is a wasteful number, since it uses less digits than its factorization.

87515121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535375.

The product of its digits is 2800, while the sum is 30.

The square root of 87515121 is about 9354.9516834669. The cubic root of 87515121 is about 443.9775727248.

Adding to 87515121 its reverse (12151578), we get a palindrome (99666699).

The spelling of 87515121 in words is "eighty-seven million, five hundred fifteen thousand, one hundred twenty-one".