124377991 has 2 divisors, whose sum is σ = 124377992. Its totient is φ = 124377990.

The previous prime is 124377989. The next prime is 124378021. The reversal of 124377991 is 199773421.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (199773421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124377991 - 2¹ = 124377989 is a prime.

Together with 124377989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124377901) 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, 62188995 + 62188996.

It is an arithmetic number, because the mean of its divisors is an integer number (62188996).

Almost surely, 2^124377991 is an apocalyptic number.

124377991 is a deficient number, since it is larger than the sum of its proper divisors (1).

124377991 is an equidigital number, since it uses as much as digits as its factorization.

124377991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 124377991 is about 11152.4881080412. The cubic root of 124377991 is about 499.1692752237.

The spelling of 124377991 in words is "one hundred twenty-four million, three hundred seventy-seven thousand, nine hundred ninety-one".