7561561 has 4 divisors (see below), whose sum is σ = 8641792. Its totient is φ = 6481332.

The previous prime is 7561537. The next prime is 7561573. The reversal of 7561561 is 1651657.

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 an emirpimes, since its reverse is a distinct semiprime: 1651657 = 7 ⋅235951.

It is a cyclic number.

It is not a de Polignac number, because 7561561 - 2¹⁵ = 7528793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7561531) 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, 540105 + ... + 540118.

It is an arithmetic number, because the mean of its divisors is an integer number (2160448).

Almost surely, 2^7561561 is an apocalyptic number.

It is an amenable number.

7561561 is a deficient number, since it is larger than the sum of its proper divisors (1080231).

7561561 is a wasteful number, since it uses less digits than its factorization.

7561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080230.

The product of its digits is 6300, while the sum is 31.

The square root of 7561561 is about 2749.8292674273. The cubic root of 7561561 is about 196.2774859740.

The spelling of 7561561 in words is "seven million, five hundred sixty-one thousand, five hundred sixty-one".