7126561 has 6 divisors (see below), whose sum is σ = 7717110. Its totient is φ = 6578208.

The previous prime is 7126549. The next prime is 7126583. The reversal of 7126561 is 1656217.

It can be written as a sum of positive squares in 3 ways, for example, as 776161 + 6350400 = 881^2 + 2520^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7126561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7126591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20916 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (1286185).

Almost surely, 2^7126561 is an apocalyptic number.

It is an amenable number.

7126561 is a deficient number, since it is larger than the sum of its proper divisors (590549).

7126561 is a wasteful number, since it uses less digits than its factorization.

7126561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42195 (or 42182 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 7126561 is about 2669.5619490845. The cubic root of 7126561 is about 192.4391081933.

The spelling of 7126561 in words is "seven million, one hundred twenty-six thousand, five hundred sixty-one".