5091861 has 4 divisors (see below), whose sum is σ = 6789152. Its totient is φ = 3394572.

The previous prime is 5091847. The next prime is 5091881. The reversal of 5091861 is 1681905.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5091861 - 2⁶ = 5091797 is a prime.

It is a D-number.

It is a Duffinian number.

5091861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5091841) 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 3 ways as a sum of consecutive naturals, for example, 848641 + ... + 848646.

It is an arithmetic number, because the mean of its divisors is an integer number (1697288).

Almost surely, 2^5091861 is an apocalyptic number.

It is an amenable number.

5091861 is a deficient number, since it is larger than the sum of its proper divisors (1697291).

5091861 is a wasteful number, since it uses less digits than its factorization.

5091861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697290.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 5091861 is about 2256.5152337177. The cubic root of 5091861 is about 172.0384468768.

The spelling of 5091861 in words is "five million, ninety-one thousand, eight hundred sixty-one".