124611821 has 2 divisors, whose sum is σ = 124611822. Its totient is φ = 124611820.

The previous prime is 124611797. The next prime is 124611827. The reversal of 124611821 is 128116421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117397225 + 7214596 = 10835^2 + 2686^2 .

It is an emirp because it is prime and its reverse (128116421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124611821 - 2²⁶ = 57502957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124611827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62305910 + 62305911.

It is an arithmetic number, because the mean of its divisors is an integer number (62305911).

Almost surely, 2^124611821 is an apocalyptic number.

It is an amenable number.

124611821 is a deficient number, since it is larger than the sum of its proper divisors (1).

124611821 is an equidigital number, since it uses as much as digits as its factorization.

124611821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 26.

The square root of 124611821 is about 11162.9664964112. The cubic root of 124611821 is about 499.4818913122.

The spelling of 124611821 in words is "one hundred twenty-four million, six hundred eleven thousand, eight hundred twenty-one".