5135821 has 4 divisors (see below), whose sum is σ = 5141500. Its totient is φ = 5130144.

The previous prime is 5135807. The next prime is 5135839. The reversal of 5135821 is 1285315.

It is a happy number.

5135821 is digitally balanced in base 3, 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 3189796 = 1395^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 5135821 - 2⁵ = 5135789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5135321) 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, 1146 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (1285375).

Almost surely, 2^5135821 is an apocalyptic number.

It is an amenable number.

5135821 is a deficient number, since it is larger than the sum of its proper divisors (5679).

5135821 is a wasteful number, since it uses less digits than its factorization.

5135821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5678.

The product of its digits is 1200, while the sum is 25.

The square root of 5135821 is about 2266.2349834031. The cubic root of 5135821 is about 172.5321203227.

The spelling of 5135821 in words is "five million, one hundred thirty-five thousand, eight hundred twenty-one".