89161691 has 4 divisors (see below), whose sum is σ = 90290400. Its totient is φ = 88032984.

The previous prime is 89161643. The next prime is 89161693. The reversal of 89161691 is 19616198.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 89161691 - 2⁶ = 89161627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89161693) 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, 564236 + ... + 564393.

It is an arithmetic number, because the mean of its divisors is an integer number (22572600).

Almost surely, 2^89161691 is an apocalyptic number.

89161691 is a deficient number, since it is larger than the sum of its proper divisors (1128709).

89161691 is a wasteful number, since it uses less digits than its factorization.

89161691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128708.

The product of its digits is 23328, while the sum is 41.

The square root of 89161691 is about 9442.5468492351. The cubic root of 89161691 is about 446.7447239267.

The spelling of 89161691 in words is "eighty-nine million, one hundred sixty-one thousand, six hundred ninety-one".