8561291 has 4 divisors (see below), whose sum is σ = 8567400. Its totient is φ = 8555184.

The previous prime is 8561281. The next prime is 8561297. The reversal of 8561291 is 1921658.

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: 1921658 = 2 ⋅960829.

It is a cyclic number.

It is not a de Polignac number, because 8561291 - 2¹⁸ = 8299147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8561297) 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, 215 + ... + 4143.

It is an arithmetic number, because the mean of its divisors is an integer number (2141850).

Almost surely, 2^8561291 is an apocalyptic number.

8561291 is a deficient number, since it is larger than the sum of its proper divisors (6109).

8561291 is a wasteful number, since it uses less digits than its factorization.

8561291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108.

The product of its digits is 4320, while the sum is 32.

The square root of 8561291 is about 2925.9683867055. The cubic root of 8561291 is about 204.5721076888.

The spelling of 8561291 in words is "eight million, five hundred sixty-one thousand, two hundred ninety-one".