8736991 has 4 divisors (see below), whose sum is σ = 8755000. Its totient is φ = 8718984.

The previous prime is 8736989. The next prime is 8737021. The reversal of 8736991 is 1996378.

8736991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8736991 - 2¹ = 8736989 is a prime.

It is a Duffinian number.

8736991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8736911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8256 + ... + 9253.

It is an arithmetic number, because the mean of its divisors is an integer number (2188750).

Almost surely, 2^8736991 is an apocalyptic number.

8736991 is a deficient number, since it is larger than the sum of its proper divisors (18009).

8736991 is a wasteful number, since it uses less digits than its factorization.

8736991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18008.

The product of its digits is 81648, while the sum is 43.

The square root of 8736991 is about 2955.8401512937. The cubic root of 8736991 is about 205.9620928144.

The spelling of 8736991 in words is "eight million, seven hundred thirty-six thousand, nine hundred ninety-one".