8697249991 has 4 divisors (see below), whose sum is σ = 8701065184. Its totient is φ = 8693434800.

The previous prime is 8697249989. The next prime is 8697250013. The reversal of 8697249991 is 1999427968.

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 8697249991 - 2¹ = 8697249989 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 (8697241991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1904175 + ... + 1908736.

It is an arithmetic number, because the mean of its divisors is an integer number (2175266296).

Almost surely, 2^8697249991 is an apocalyptic number.

8697249991 is a deficient number, since it is larger than the sum of its proper divisors (3815193).

8697249991 is a wasteful number, since it uses less digits than its factorization.

8697249991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815192.

The product of its digits is 17635968, while the sum is 64.

The square root of 8697249991 is about 93259.0477701762. The cubic root of 8697249991 is about 2056.4933894867.

The spelling of 8697249991 in words is "eight billion, six hundred ninety-seven million, two hundred forty-nine thousand, nine hundred ninety-one".