124539991 has 2 divisors, whose sum is σ = 124539992. Its totient is φ = 124539990.

The previous prime is 124539959. The next prime is 124540019. The reversal of 124539991 is 199935421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 124539991 - 2⁵ = 124539959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124539901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62269995 + 62269996.

It is an arithmetic number, because the mean of its divisors is an integer number (62269996).

Almost surely, 2^124539991 is an apocalyptic number.

124539991 is a deficient number, since it is larger than the sum of its proper divisors (1).

124539991 is an equidigital number, since it uses as much as digits as its factorization.

124539991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 124539991 is about 11159.7486978874. The cubic root of 124539991 is about 499.3859007396.

The spelling of 124539991 in words is "one hundred twenty-four million, five hundred thirty-nine thousand, nine hundred ninety-one".