8241969199689 has 135 divisors (see below), whose sum is σ = 13120025894157. Its totient is φ = 5177304468072.

The previous prime is 8241969199669. The next prime is 8241969199721. The reversal of 8241969199689 is 9869919691428.

The square root of 8241969199689 is 2870883.

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

8241969199689 is a `hidden beast` number, since 8 + 2 + 419 + 6 + 9 + 199 + 6 + 8 + 9 = 666.

It is not a de Polignac number, because 8241969199689 - 2⁷ = 8241969199561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (8241969199649) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 123014465634 + ... + 123014465700.

Almost surely, 2^{8241969199689} is an apocalyptic number.

8241969199689 is the 2870883-rd square number.

8241969199689 is the 1435442-nd centered octagonal number.

It is an amenable number.

8241969199689 is a deficient number, since it is larger than the sum of its proper divisors (4878056694468).

8241969199689 is an frugal number, since it uses more digits than its factorization.

8241969199689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 93 counting only the distinct ones).

The product of its digits is 1088391168, while the sum is 81.

Multiplying 8241969199689 by its sum of digits (81), we get a square (667599505174809 = 25837947²).

8241969199689 divided by its sum of digits (81) gives a square (101752706169 = 318987²).

The spelling of 8241969199689 in words is "eight trillion, two hundred forty-one billion, nine hundred sixty-nine million, one hundred ninety-nine thousand, six hundred eighty-nine".