5191821 has 12 divisors (see below), whose sum is σ = 7520448. Its totient is φ = 3451464.

The previous prime is 5191819. The next prime is 5191831. The reversal of 5191821 is 1281915.

It is not a de Polignac number, because 5191821 - 2¹ = 5191819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5191831) 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, 4156 + ... + 5258.

It is an arithmetic number, because the mean of its divisors is an integer number (626704).

Almost surely, 2^5191821 is an apocalyptic number.

It is an amenable number.

5191821 is a deficient number, since it is larger than the sum of its proper divisors (2328627).

5191821 is a wasteful number, since it uses less digits than its factorization.

5191821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1629 counting only the distinct ones).

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

The square root of 5191821 is about 2278.5567800693. The cubic root of 5191821 is about 173.1569404591.

The spelling of 5191821 in words is "five million, one hundred ninety-one thousand, eight hundred twenty-one".