124857989 has 2 divisors, whose sum is σ = 124857990. Its totient is φ = 124857988.

The previous prime is 124857937. The next prime is 124858039. The reversal of 124857989 is 989758421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116273089 + 8584900 = 10783^2 + 2930^2 .

It is a cyclic number.

It is not a de Polignac number, because 124857989 - 2¹² = 124853893 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 124857989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124887989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62428994 + 62428995.

It is an arithmetic number, because the mean of its divisors is an integer number (62428995).

Almost surely, 2^124857989 is an apocalyptic number.

It is an amenable number.

124857989 is a deficient number, since it is larger than the sum of its proper divisors (1).

124857989 is an equidigital number, since it uses as much as digits as its factorization.

124857989 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 124857989 is about 11173.9871576801. The cubic root of 124857989 is about 499.8105802494.

The spelling of 124857989 in words is "one hundred twenty-four million, eight hundred fifty-seven thousand, nine hundred eighty-nine".