124640129 has 2 divisors, whose sum is σ = 124640130. Its totient is φ = 124640128.

The previous prime is 124640093. The next prime is 124640137. The reversal of 124640129 is 921046421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115777600 + 8862529 = 10760^2 + 2977^2 .

It is an emirp because it is prime and its reverse (921046421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124640129 is a prime.

It is not a weakly prime, because it can be changed into another prime (124640179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62320064 + 62320065.

It is an arithmetic number, because the mean of its divisors is an integer number (62320065).

Almost surely, 2^124640129 is an apocalyptic number.

It is an amenable number.

124640129 is a deficient number, since it is larger than the sum of its proper divisors (1).

124640129 is an equidigital number, since it uses as much as digits as its factorization.

124640129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 124640129 is about 11164.2343669416. The cubic root of 124640129 is about 499.5197107923.

The spelling of 124640129 in words is "one hundred twenty-four million, six hundred forty thousand, one hundred twenty-nine".