4131921 has 8 divisors (see below), whose sum is σ = 5519680. Its totient is φ = 2749392.

The previous prime is 4131917. The next prime is 4131923. The reversal of 4131921 is 1291314.

4131921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4131921 - 2² = 4131917 is a prime.

It is a Duffinian number.

4131921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4131923) 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 in 7 ways as a sum of consecutive naturals, for example, 1260 + ... + 3138.

It is an arithmetic number, because the mean of its divisors is an integer number (689960).

Almost surely, 2^4131921 is an apocalyptic number.

It is an amenable number.

4131921 is a deficient number, since it is larger than the sum of its proper divisors (1387759).

4131921 is a wasteful number, since it uses less digits than its factorization.

4131921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615.

The product of its digits is 216, while the sum is 21.

The square root of 4131921 is about 2032.7127194958. The cubic root of 4131921 is about 160.4663607065.

The spelling of 4131921 in words is "four million, one hundred thirty-one thousand, nine hundred twenty-one".