124989857 has 2 divisors, whose sum is σ = 124989858. Its totient is φ = 124989856.

The previous prime is 124989841. The next prime is 124989869. The reversal of 124989857 is 758989421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115261696 + 9728161 = 10736^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 124989857 - 2⁴ = 124989841 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 124989799 and 124989808.

It is not a weakly prime, because it can be changed into another prime (124989817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62494928 + 62494929.

It is an arithmetic number, because the mean of its divisors is an integer number (62494929).

Almost surely, 2^124989857 is an apocalyptic number.

It is an amenable number.

124989857 is a deficient number, since it is larger than the sum of its proper divisors (1).

124989857 is an equidigital number, since it uses as much as digits as its factorization.

124989857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 124989857 is about 11179.8862695468. The cubic root of 124989857 is about 499.9864756342.

The spelling of 124989857 in words is "one hundred twenty-four million, nine hundred eighty-nine thousand, eight hundred fifty-seven".