124666621 has 4 divisors (see below), whose sum is σ = 128965500. Its totient is φ = 120367744.

The previous prime is 124666603. The next prime is 124666637. The reversal of 124666621 is 126666421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95355225 + 29311396 = 9765^2 + 5414^2 .

It is a cyclic number.

It is not a de Polignac number, because 124666621 - 2¹⁵ = 124633853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124666681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2149396 + ... + 2149453.

It is an arithmetic number, because the mean of its divisors is an integer number (32241375).

Almost surely, 2^124666621 is an apocalyptic number.

It is an amenable number.

124666621 is a deficient number, since it is larger than the sum of its proper divisors (4298879).

124666621 is an equidigital number, since it uses as much as digits as its factorization.

124666621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298878.

The product of its digits is 20736, while the sum is 34.

The square root of 124666621 is about 11165.4207712921. The cubic root of 124666621 is about 499.5550989101. Note that the first 3 decimals are identical.

The spelling of 124666621 in words is "one hundred twenty-four million, six hundred sixty-six thousand, six hundred twenty-one".