87161717 has 4 divisors (see below), whose sum is σ = 87191340. Its totient is φ = 87132096.

The previous prime is 87161713. The next prime is 87161783. The reversal of 87161717 is 71716178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44009956 + 43151761 = 6634^2 + 6569^2 .

It is a cyclic number.

It is not a de Polignac number, because 87161717 - 2² = 87161713 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 (87161713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9842 + ... + 16467.

It is an arithmetic number, because the mean of its divisors is an integer number (21797835).

Almost surely, 2^87161717 is an apocalyptic number.

It is an amenable number.

87161717 is a deficient number, since it is larger than the sum of its proper divisors (29623).

87161717 is a wasteful number, since it uses less digits than its factorization.

87161717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29622.

The product of its digits is 16464, while the sum is 38.

The square root of 87161717 is about 9336.0439694766. The cubic root of 87161717 is about 443.3791423196.

It can be divided in two parts, 8716171 and 7, that added together give a palindrome (8716178).

The spelling of 87161717 in words is "eighty-seven million, one hundred sixty-one thousand, seven hundred seventeen".