124991 has 2 divisors, whose sum is σ = 124992. Its totient is φ = 124990.

The previous prime is 124987. The next prime is 125003. The reversal of 124991 is 199421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 124991 - 2² = 124987 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 124991.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 124991.

It is not a weakly prime, because it can be changed into another prime (124951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62495 + 62496.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

124991 is a Friedman number, since it can be written as (41+9)^(2+1)-9, using all its digits and the basic arithmetic operations.

2¹²⁴⁹⁹¹ is an apocalyptic number.

124991 is a deficient number, since it is larger than the sum of its proper divisors (1).

124991 is an equidigital number, since it uses as much as digits as its factorization.

124991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

The square root of 124991 is about 353.5406624421. The cubic root of 124991 is about 49.9987999712.

The spelling of 124991 in words is "one hundred twenty-four thousand, nine hundred ninety-one".