8126561 has 8 divisors (see below), whose sum is σ = 8691624. Its totient is φ = 7571200.

The previous prime is 8126539. The next prime is 8126581. The reversal of 8126561 is 1656218.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3041536 + 5085025 = 1744^2 + 2255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8126561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8126581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650 + ... + 4083.

It is an arithmetic number, because the mean of its divisors is an integer number (1086453).

Almost surely, 2^8126561 is an apocalyptic number.

It is an amenable number.

8126561 is a deficient number, since it is larger than the sum of its proper divisors (565063).

8126561 is a wasteful number, since it uses less digits than its factorization.

8126561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851.

The product of its digits is 2880, while the sum is 29.

The square root of 8126561 is about 2850.7123671111. The cubic root of 8126561 is about 201.0491616751.

The spelling of 8126561 in words is "eight million, one hundred twenty-six thousand, five hundred sixty-one".