7100561 has 4 divisors (see below), whose sum is σ = 7646772. Its totient is φ = 6554352.

The previous prime is 7100557. The next prime is 7100579. The reversal of 7100561 is 1650017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1650017 = 19 ⋅86843.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 5612161 = 1220^2 + 2369^2 .

It is a cyclic number.

It is not a de Polignac number, because 7100561 - 2² = 7100557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7100501) 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, 273086 + ... + 273111.

It is an arithmetic number, because the mean of its divisors is an integer number (1911693).

Almost surely, 2^7100561 is an apocalyptic number.

It is an amenable number.

7100561 is a deficient number, since it is larger than the sum of its proper divisors (546211).

7100561 is a wasteful number, since it uses less digits than its factorization.

7100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546210.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 7100561 is about 2664.6877865896. The cubic root of 7100561 is about 192.2047963062.

Adding to 7100561 its reverse (1650017), we get a palindrome (8750578).

The spelling of 7100561 in words is "seven million, one hundred thousand, five hundred sixty-one".