124991971 has 4 divisors (see below), whose sum is σ = 134606752. Its totient is φ = 115377192.

The previous prime is 124991887. The next prime is 124992017. The reversal of 124991971 is 179199421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179199421 = 3323 ⋅53927.

It is a cyclic number.

It is not a de Polignac number, because 124991971 - 2⁹ = 124991459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124991371) 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 in 3 ways as a sum of consecutive naturals, for example, 4807371 + ... + 4807396.

It is an arithmetic number, because the mean of its divisors is an integer number (33651688).

Almost surely, 2^124991971 is an apocalyptic number.

124991971 is a deficient number, since it is larger than the sum of its proper divisors (9614781).

124991971 is an equidigital number, since it uses as much as digits as its factorization.

124991971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9614780.

The product of its digits is 40824, while the sum is 43.

The square root of 124991971 is about 11179.9808139370. The cubic root of 124991971 is about 499.9892944375.

The spelling of 124991971 in words is "one hundred twenty-four million, nine hundred ninety-one thousand, nine hundred seventy-one".