6538381 has 4 divisors (see below), whose sum is σ = 6715132. Its totient is φ = 6361632.

The previous prime is 6538373. The next prime is 6538403. The reversal of 6538381 is 1838356.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3865156 + 2673225 = 1966^2 + 1635^2 .

It is not a de Polignac number, because 6538381 - 2³ = 6538373 is a prime.

It is a super-2 number, since 2×6538381² = 85500852202322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6538331) 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, 88320 + ... + 88393.

It is an arithmetic number, because the mean of its divisors is an integer number (1678783).

Almost surely, 2^6538381 is an apocalyptic number.

It is an amenable number.

6538381 is a deficient number, since it is larger than the sum of its proper divisors (176751).

6538381 is a wasteful number, since it uses less digits than its factorization.

6538381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176750.

The product of its digits is 17280, while the sum is 34.

The square root of 6538381 is about 2557.0258113676. The cubic root of 6538381 is about 186.9921641602.

The spelling of 6538381 in words is "six million, five hundred thirty-eight thousand, three hundred eighty-one".