124666561 has 2 divisors, whose sum is σ = 124666562. Its totient is φ = 124666560.

The previous prime is 124666523. The next prime is 124666567. The reversal of 124666561 is 165666421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101626561 + 23040000 = 10081^2 + 4800^2 .

It is an emirp because it is prime and its reverse (165666421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124666561 - 2⁷ = 124666433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124666561.

It is not a weakly prime, because it can be changed into another prime (124666567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62333280 + 62333281.

It is an arithmetic number, because the mean of its divisors is an integer number (62333281).

Almost surely, 2^124666561 is an apocalyptic number.

It is an amenable number.

124666561 is a deficient number, since it is larger than the sum of its proper divisors (1).

124666561 is an equidigital number, since it uses as much as digits as its factorization.

124666561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 124666561 is about 11165.4180844248. The cubic root of 124666561 is about 499.5550187676. Note that the first 3 decimals are identical.

The spelling of 124666561 in words is "one hundred twenty-four million, six hundred sixty-six thousand, five hundred sixty-one".