7279561 has 4 divisors (see below), whose sum is σ = 7286400. Its totient is φ = 7272724.

The previous prime is 7279549. The next prime is 7279567. The reversal of 7279561 is 1659727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7279561 - 2⁵ = 7279529 is a prime.

It is a Duffinian number.

7279561 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7279561.

It is not an unprimeable number, because it can be changed into a prime (7279567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441 + ... + 4078.

It is an arithmetic number, because the mean of its divisors is an integer number (1821600).

Almost surely, 2^7279561 is an apocalyptic number.

It is an amenable number.

7279561 is a deficient number, since it is larger than the sum of its proper divisors (6839).

7279561 is a wasteful number, since it uses less digits than its factorization.

7279561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838.

The product of its digits is 26460, while the sum is 37.

The square root of 7279561 is about 2698.0661593074. The cubic root of 7279561 is about 193.8065258589.

The spelling of 7279561 in words is "seven million, two hundred seventy-nine thousand, five hundred sixty-one".