6537421 has 4 divisors (see below), whose sum is σ = 7131744. Its totient is φ = 5943100.

The previous prime is 6537407. The next prime is 6537437. The reversal of 6537421 is 1247356.

6537421 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6537421 is a prime.

It is a Duffinian number.

6537421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6537421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6537521) 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, 297145 + ... + 297166.

It is an arithmetic number, because the mean of its divisors is an integer number (1782936).

Almost surely, 2^6537421 is an apocalyptic number.

It is an amenable number.

6537421 is a deficient number, since it is larger than the sum of its proper divisors (594323).

6537421 is a wasteful number, since it uses less digits than its factorization.

6537421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594322.

The product of its digits is 5040, while the sum is 28.

The square root of 6537421 is about 2556.8380863872. The cubic root of 6537421 is about 186.9830119830.

The spelling of 6537421 in words is "six million, five hundred thirty-seven thousand, four hundred twenty-one".