124209857 has 2 divisors, whose sum is σ = 124209858. Its totient is φ = 124209856.

The previous prime is 124209853. The next prime is 124209881. The reversal of 124209857 is 758902421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123854641 + 355216 = 11129^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 124209857 - 2² = 124209853 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124209857.

It is not a weakly prime, because it can be changed into another prime (124209853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62104928 + 62104929.

It is an arithmetic number, because the mean of its divisors is an integer number (62104929).

Almost surely, 2^124209857 is an apocalyptic number.

It is an amenable number.

124209857 is a deficient number, since it is larger than the sum of its proper divisors (1).

124209857 is an equidigital number, since it uses as much as digits as its factorization.

124209857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 124209857 is about 11144.9475996974. The cubic root of 124209857 is about 498.9442483459.

The spelling of 124209857 in words is "one hundred twenty-four million, two hundred nine thousand, eight hundred fifty-seven".