7209561 has 8 divisors (see below), whose sum is σ = 9872704. Its totient is φ = 4676400.

The previous prime is 7209551. The next prime is 7209589. The reversal of 7209561 is 1659027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7209561 - 2¹⁴ = 7193177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7209541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32365 + ... + 32586.

It is an arithmetic number, because the mean of its divisors is an integer number (1234088).

Almost surely, 2^7209561 is an apocalyptic number.

It is an amenable number.

7209561 is a deficient number, since it is larger than the sum of its proper divisors (2663143).

7209561 is a wasteful number, since it uses less digits than its factorization.

7209561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64991.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 7209561 is about 2685.0625691034. The cubic root of 7209561 is about 193.1833117452.

The spelling of 7209561 in words is "seven million, two hundred nine thousand, five hundred sixty-one".