87517861 has 4 divisors (see below), whose sum is σ = 87544800. Its totient is φ = 87490924.

The previous prime is 87517847. The next prime is 87517877. The reversal of 87517861 is 16871578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87517861 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 (87517831) 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, 7801 + ... + 15358.

It is an arithmetic number, because the mean of its divisors is an integer number (21886200).

Almost surely, 2^87517861 is an apocalyptic number.

It is an amenable number.

87517861 is a deficient number, since it is larger than the sum of its proper divisors (26939).

87517861 is a wasteful number, since it uses less digits than its factorization.

87517861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26938.

The product of its digits is 94080, while the sum is 43.

The square root of 87517861 is about 9355.0981288279. The cubic root of 87517861 is about 443.9822061559.

The spelling of 87517861 in words is "eighty-seven million, five hundred seventeen thousand, eight hundred sixty-one".