5161891 has 4 divisors (see below), whose sum is σ = 5899312. Its totient is φ = 4424472.

The previous prime is 5161879. The next prime is 5161909. The reversal of 5161891 is 1981615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1981615 = 5 ⋅396323.

It is a cyclic number.

It is not a de Polignac number, because 5161891 - 2¹³ = 5153699 is a prime.

It is a Duffinian number.

5161891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5161811) 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, 368700 + ... + 368713.

It is an arithmetic number, because the mean of its divisors is an integer number (1474828).

Almost surely, 2^5161891 is an apocalyptic number.

5161891 is a deficient number, since it is larger than the sum of its proper divisors (737421).

5161891 is an equidigital number, since it uses as much as digits as its factorization.

5161891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737420.

The product of its digits is 2160, while the sum is 31.

The square root of 5161891 is about 2271.9795333585. The cubic root of 5161891 is about 172.8235585129.

The spelling of 5161891 in words is "five million, one hundred sixty-one thousand, eight hundred ninety-one".