12700561 has 2 divisors, whose sum is σ = 12700562. Its totient is φ = 12700560.

The previous prime is 12700559. The next prime is 12700573. The reversal of 12700561 is 16500721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12559936 + 140625 = 3544^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 12700561 - 2¹ = 12700559 is a prime.

It is a super-2 number, since 2×12700561² = 322608499429442, which contains 22 as substring.

Together with 12700559, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12700511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6350280 + 6350281.

It is an arithmetic number, because the mean of its divisors is an integer number (6350281).

Almost surely, 2^12700561 is an apocalyptic number.

It is an amenable number.

12700561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12700561 is an equidigital number, since it uses as much as digits as its factorization.

12700561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 12700561 is about 3563.7846455699. The cubic root of 12700561 is about 233.3140907034.

The spelling of 12700561 in words is "twelve million, seven hundred thousand, five hundred sixty-one".