124717891 has 4 divisors (see below), whose sum is σ = 130140432. Its totient is φ = 119295352.

The previous prime is 124717883. The next prime is 124717897. The reversal of 124717891 is 198717421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198717421 = 7 ⋅28388203.

It is a cyclic number.

It is not a de Polignac number, because 124717891 - 2³ = 124717883 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (124717897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2711236 + ... + 2711281.

It is an arithmetic number, because the mean of its divisors is an integer number (32535108).

Almost surely, 2^124717891 is an apocalyptic number.

124717891 is a deficient number, since it is larger than the sum of its proper divisors (5422541).

124717891 is an equidigital number, since it uses as much as digits as its factorization.

124717891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422540.

The product of its digits is 28224, while the sum is 40.

The square root of 124717891 is about 11167.7164630913. The cubic root of 124717891 is about 499.6235713407.

The spelling of 124717891 in words is "one hundred twenty-four million, seven hundred seventeen thousand, eight hundred ninety-one".