8721309441 has 32 divisors (see below), whose sum is σ = 13162947840. Its totient is φ = 5096070144.

The previous prime is 8721309413. The next prime is 8721309473. The reversal of 8721309441 is 1449031278.

It is not a de Polignac number, because 8721309441 - 2⁵ = 8721309409 is a prime.

It is a super-2 number, since 2×8721309441² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 8721309441.

It is not an unprimeable number, because it can be changed into a prime (8721309341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87405 + ... + 158373.

It is an arithmetic number, because the mean of its divisors is an integer number (411342120).

Almost surely, 2^8721309441 is an apocalyptic number.

It is an amenable number.

8721309441 is a deficient number, since it is larger than the sum of its proper divisors (4441638399).

8721309441 is a wasteful number, since it uses less digits than its factorization.

8721309441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71145.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 8721309441 is about 93387.9512624621. The cubic root of 8721309441 is about 2058.3879556118.

The spelling of 8721309441 in words is "eight billion, seven hundred twenty-one million, three hundred nine thousand, four hundred forty-one".