6751321 has 4 divisors (see below), whose sum is σ = 6775972. Its totient is φ = 6726672.

The previous prime is 6751313. The next prime is 6751337. The reversal of 6751321 is 1231576.

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 1625625 + 5125696 = 1275^2 + 2264^2 .

It is a cyclic number.

It is not a de Polignac number, because 6751321 - 2³ = 6751313 is a prime.

It is a Duffinian number.

6751321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6751391) 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, 11910 + ... + 12463.

It is an arithmetic number, because the mean of its divisors is an integer number (1693993).

Almost surely, 2^6751321 is an apocalyptic number.

It is an amenable number.

6751321 is a deficient number, since it is larger than the sum of its proper divisors (24651).

6751321 is a wasteful number, since it uses less digits than its factorization.

6751321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24650.

The product of its digits is 1260, while the sum is 25.

The square root of 6751321 is about 2598.3304254848. The cubic root of 6751321 is about 189.0004852409. Note that the first 3 decimals are identical.

Adding to 6751321 its reverse (1231576), we get a palindrome (7982897).

The spelling of 6751321 in words is "six million, seven hundred fifty-one thousand, three hundred twenty-one".