5131821 has 4 divisors (see below), whose sum is σ = 6842432. Its totient is φ = 3421212.

The previous prime is 5131813. The next prime is 5131823. The reversal of 5131821 is 1281315.

5131821 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5131821 - 2³ = 5131813 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5131823) 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, 855301 + ... + 855306.

It is an arithmetic number, because the mean of its divisors is an integer number (1710608).

Almost surely, 2^5131821 is an apocalyptic number.

It is an amenable number.

5131821 is a deficient number, since it is larger than the sum of its proper divisors (1710611).

5131821 is a wasteful number, since it uses less digits than its factorization.

5131821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710610.

The product of its digits is 240, while the sum is 21.

The square root of 5131821 is about 2265.3522904838. The cubic root of 5131821 is about 172.4873168579.

The spelling of 5131821 in words is "five million, one hundred thirty-one thousand, eight hundred twenty-one".