124542139 has 2 divisors, whose sum is σ = 124542140. Its totient is φ = 124542138.

The previous prime is 124542137. The next prime is 124542163. The reversal of 124542139 is 931245421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 124542139 - 2¹ = 124542137 is a prime.

Together with 124542137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 124542139.

It is not a weakly prime, because it can be changed into another prime (124542137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62271069 + 62271070.

It is an arithmetic number, because the mean of its divisors is an integer number (62271070).

Almost surely, 2^124542139 is an apocalyptic number.

124542139 is a deficient number, since it is larger than the sum of its proper divisors (1).

124542139 is an equidigital number, since it uses as much as digits as its factorization.

124542139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 124542139 is about 11159.8449361987. The cubic root of 124542139 is about 499.3887717712.

The spelling of 124542139 in words is "one hundred twenty-four million, five hundred forty-two thousand, one hundred thirty-nine".