8736509221 has 16 divisors (see below), whose sum is σ = 9961838208. Its totient is φ = 7584192000.

The previous prime is 8736509209. The next prime is 8736509237. The reversal of 8736509221 is 1229056378.

It is not a de Polignac number, because 8736509221 - 2¹³ = 8736501029 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 (8736509291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123325 + ... + 180781.

It is an arithmetic number, because the mean of its divisors is an integer number (622614888).

Almost surely, 2^8736509221 is an apocalyptic number.

It is an amenable number.

8736509221 is a deficient number, since it is larger than the sum of its proper divisors (1225328987).

8736509221 is a wasteful number, since it uses less digits than its factorization.

8736509221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58092.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 8736509221 is about 93469.2956055624. The cubic root of 8736509221 is about 2059.5830699405.

The spelling of 8736509221 in words is "eight billion, seven hundred thirty-six million, five hundred nine thousand, two hundred twenty-one".