124971891 has 16 divisors (see below), whose sum is σ = 182020608. Its totient is φ = 75639200.

The previous prime is 124971887. The next prime is 124971907. The reversal of 124971891 is 198179421.

It is a cyclic number.

It is not a de Polignac number, because 124971891 - 2² = 124971887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (124971851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27985 + ... + 32141.

It is an arithmetic number, because the mean of its divisors is an integer number (11376288).

Almost surely, 2^124971891 is an apocalyptic number.

124971891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

124971891 is a deficient number, since it is larger than the sum of its proper divisors (57048717).

124971891 is a wasteful number, since it uses less digits than its factorization.

124971891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5082.

The product of its digits is 36288, while the sum is 42.

The square root of 124971891 is about 11179.0827441253. The cubic root of 124971891 is about 499.9625185237.

The spelling of 124971891 in words is "one hundred twenty-four million, nine hundred seventy-one thousand, eight hundred ninety-one".