5151891 has 4 divisors (see below), whose sum is σ = 6869192. Its totient is φ = 3434592.

The previous prime is 5151889. The next prime is 5151899. The reversal of 5151891 is 1981515.

5151891 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 5151891 - 2¹ = 5151889 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5151899) 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, 858646 + ... + 858651.

It is an arithmetic number, because the mean of its divisors is an integer number (1717298).

Almost surely, 2^5151891 is an apocalyptic number.

5151891 is a deficient number, since it is larger than the sum of its proper divisors (1717301).

5151891 is a wasteful number, since it uses less digits than its factorization.

5151891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717300.

The product of its digits is 1800, while the sum is 30.

The square root of 5151891 is about 2269.7777424233. Note that the first 4 decimals coincide. The cubic root of 5151891 is about 172.7118841407.

The spelling of 5151891 in words is "five million, one hundred fifty-one thousand, eight hundred ninety-one".