124981999 has 2 divisors, whose sum is σ = 124982000. Its totient is φ = 124981998.

The previous prime is 124981993. The next prime is 124982009. The reversal of 124981999 is 999189421.

It is a weak prime.

It is an emirp because it is prime and its reverse (999189421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124981999 - 2¹⁷ = 124850927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124981993) 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, 62490999 + 62491000.

It is an arithmetic number, because the mean of its divisors is an integer number (62491000).

Almost surely, 2^124981999 is an apocalyptic number.

124981999 is a deficient number, since it is larger than the sum of its proper divisors (1).

124981999 is an equidigital number, since it uses as much as digits as its factorization.

124981999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 52.

The square root of 124981999 is about 11179.5348293209. The cubic root of 124981999 is about 499.9759975144.

The spelling of 124981999 in words is "one hundred twenty-four million, nine hundred eighty-one thousand, nine hundred ninety-nine".