124081991 has 12 divisors (see below), whose sum is σ = 138631752. Its totient is φ = 110946000.

The previous prime is 124081973. The next prime is 124081999. The reversal of 124081991 is 199180421.

It is not a de Polignac number, because 124081991 - 2¹⁰ = 124080967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124081999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1025 + ... + 15786.

It is an arithmetic number, because the mean of its divisors is an integer number (11552646).

Almost surely, 2^124081991 is an apocalyptic number.

124081991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

124081991 is a deficient number, since it is larger than the sum of its proper divisors (14549761).

124081991 is a wasteful number, since it uses less digits than its factorization.

124081991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16894 (or 16883 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 124081991 is about 11139.2096218717. The cubic root of 124081991 is about 498.7729793036.

The spelling of 124081991 in words is "one hundred twenty-four million, eighty-one thousand, nine hundred ninety-one".