7306561 has 4 divisors (see below), whose sum is σ = 7314052. Its totient is φ = 7299072.

The previous prime is 7306553. The next prime is 7306567. The reversal of 7306561 is 1656037.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1656037 = 109 ⋅15193.

It can be written as a sum of positive squares in 2 ways, for example, as 4223025 + 3083536 = 2055^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 7306561 - 2³ = 7306553 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 (7306567) 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, 2016 + ... + 4321.

It is an arithmetic number, because the mean of its divisors is an integer number (1828513).

It is a Poulet number, since it divides 2^7306560-1.

Almost surely, 2^7306561 is an apocalyptic number.

It is an amenable number.

7306561 is a deficient number, since it is larger than the sum of its proper divisors (7491).

7306561 is a wasteful number, since it uses less digits than its factorization.

7306561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 7306561 is about 2703.0651120534. The cubic root of 7306561 is about 194.0458406571.

The spelling of 7306561 in words is "seven million, three hundred six thousand, five hundred sixty-one".