6351421 has 4 divisors (see below), whose sum is σ = 6725052. Its totient is φ = 5977792.

The previous prime is 6351403. The next prime is 6351431. The reversal of 6351421 is 1241536.

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 4056196 + 2295225 = 2014^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 6351421 - 2¹¹ = 6349373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6351392 and 6351401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6351431) 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, 186790 + ... + 186823.

It is an arithmetic number, because the mean of its divisors is an integer number (1681263).

Almost surely, 2^6351421 is an apocalyptic number.

It is an amenable number.

6351421 is a deficient number, since it is larger than the sum of its proper divisors (373631).

6351421 is a wasteful number, since it uses less digits than its factorization.

6351421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373630.

The product of its digits is 720, while the sum is 22.

The square root of 6351421 is about 2520.2025712232. The cubic root of 6351421 is about 185.1926019464.

Adding to 6351421 its reverse (1241536), we get a palindrome (7592957).

The spelling of 6351421 in words is "six million, three hundred fifty-one thousand, four hundred twenty-one".