5091821 has 8 divisors (see below), whose sum is σ = 5880000. Its totient is φ = 4318848.

The previous prime is 5091817. The next prime is 5091833. The reversal of 5091821 is 1281905.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 5091821 - 2² = 5091817 is a prime.

It is an Ulam number.

It is a Curzon 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3071 + ... + 4428.

It is an arithmetic number, because the mean of its divisors is an integer number (735000).

Almost surely, 2^5091821 is an apocalyptic number.

It is an amenable number.

5091821 is a deficient number, since it is larger than the sum of its proper divisors (788179).

5091821 is an equidigital number, since it uses as much as digits as its factorization.

5091821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7603.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 5091821 is about 2256.5063704763. The cubic root of 5091821 is about 172.0379963830.

The spelling of 5091821 in words is "five million, ninety-one thousand, eight hundred twenty-one".