89117561 has 4 divisors (see below), whose sum is σ = 95972772. Its totient is φ = 82262352.

The previous prime is 89117527. The next prime is 89117599. The reversal of 89117561 is 16571198.

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 56911936 + 32205625 = 7544^2 + 5675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89117561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89117521) 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, 3427586 + ... + 3427611.

It is an arithmetic number, because the mean of its divisors is an integer number (23993193).

Almost surely, 2^89117561 is an apocalyptic number.

It is an amenable number.

89117561 is a deficient number, since it is larger than the sum of its proper divisors (6855211).

89117561 is a wasteful number, since it uses less digits than its factorization.

89117561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6855210.

The product of its digits is 15120, while the sum is 38.

The square root of 89117561 is about 9440.2097963975. The cubic root of 89117561 is about 446.6710072967.

The spelling of 89117561 in words is "eighty-nine million, one hundred seventeen thousand, five hundred sixty-one".