89818291809 has 27 divisors (see below), whose sum is σ = 130567465587. Its totient is φ = 59498246016.

The previous prime is 89818291757. The next prime is 89818291813. The reversal of 89818291809 is 90819281898.

The square root of 89818291809 is 299697.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 36490550625 + 53327741184 = 191025^2 + 230928^2 .

It is not a de Polignac number, because 89818291809 - 2²³ = 89809903201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89818291609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 254442577 + ... + 254442929.

Almost surely, 2^89818291809 is an apocalyptic number.

89818291809 is the 299697-th square number.

89818291809 is the 149849-th centered octagonal number.

It is an amenable number.

89818291809 is a deficient number, since it is larger than the sum of its proper divisors (40749173778).

89818291809 is an frugal number, since it uses more digits than its factorization.

89818291809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 63.

The spelling of 89818291809 in words is "eighty-nine billion, eight hundred eighteen million, two hundred ninety-one thousand, eight hundred nine".