5121891 has 12 divisors (see below), whose sum is σ = 7475832. Its totient is φ = 3378816.

The previous prime is 5121889. The next prime is 5121901. The reversal of 5121891 is 1981215.

5121891 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5121891 - 2¹ = 5121889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5121821) 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, 2061 + ... + 3806.

It is an arithmetic number, because the mean of its divisors is an integer number (622986).

Almost surely, 2^5121891 is an apocalyptic number.

5121891 is a deficient number, since it is larger than the sum of its proper divisors (2353941).

5121891 is a wasteful number, since it uses less digits than its factorization.

5121891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970 (or 5967 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 5121891 is about 2263.1595171353. The cubic root of 5121891 is about 172.3759915283.

The spelling of 5121891 in words is "five million, one hundred twenty-one thousand, eight hundred ninety-one".