8130561 has 4 divisors (see below), whose sum is σ = 10840752. Its totient is φ = 5420372.

The previous prime is 8130553. The next prime is 8130581. The reversal of 8130561 is 1650318.

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.

It is a cyclic number.

It is not a de Polignac number, because 8130561 - 2³ = 8130553 is a prime.

It is a super-2 number, since 2×8130561² = 132212044349442, which contains 22 as substring.

8130561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8130581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355091 + ... + 1355096.

It is an arithmetic number, because the mean of its divisors is an integer number (2710188).

It is a Proth number, since it is equal to 1985 ⋅ 2¹² + 1 and 1985 < 2¹².

Almost surely, 2^8130561 is an apocalyptic number.

It is an amenable number.

8130561 is a deficient number, since it is larger than the sum of its proper divisors (2710191).

8130561 is a wasteful number, since it uses less digits than its factorization.

8130561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710190.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 8130561 is about 2851.4138598246. The cubic root of 8130561 is about 201.0821426100.

Adding to 8130561 its reverse (1650318), we get a palindrome (9780879).

The spelling of 8130561 in words is "eight million, one hundred thirty thousand, five hundred sixty-one".