124839521 has 2 divisors, whose sum is σ = 124839522. Its totient is φ = 124839520.

The previous prime is 124839503. The next prime is 124839523. The reversal of 124839521 is 125938421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82446400 + 42393121 = 9080^2 + 6511^2 .

It is a cyclic number.

It is not a de Polignac number, because 124839521 - 2¹⁴ = 124823137 is a prime.

Together with 124839523, 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 (124839523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62419760 + 62419761.

It is an arithmetic number, because the mean of its divisors is an integer number (62419761).

Almost surely, 2^124839521 is an apocalyptic number.

It is an amenable number.

124839521 is a deficient number, since it is larger than the sum of its proper divisors (1).

124839521 is an equidigital number, since it uses as much as digits as its factorization.

124839521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 124839521 is about 11173.1607434960. The cubic root of 124839521 is about 499.7859363666.

The spelling of 124839521 in words is "one hundred twenty-four million, eight hundred thirty-nine thousand, five hundred twenty-one".