124986821 has 2 divisors, whose sum is σ = 124986822. Its totient is φ = 124986820.

The previous prime is 124986803. The next prime is 124986887. The reversal of 124986821 is 128689421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 51696100 = 8561^2 + 7190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124986821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124916821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62493410 + 62493411.

It is an arithmetic number, because the mean of its divisors is an integer number (62493411).

Almost surely, 2^124986821 is an apocalyptic number.

It is an amenable number.

124986821 is a deficient number, since it is larger than the sum of its proper divisors (1).

124986821 is an equidigital number, since it uses as much as digits as its factorization.

124986821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 124986821 is about 11179.7504891657. The cubic root of 124986821 is about 499.9824273824.

The spelling of 124986821 in words is "one hundred twenty-four million, nine hundred eighty-six thousand, eight hundred twenty-one".