6921481 has 4 divisors (see below), whose sum is σ = 7910272. Its totient is φ = 5932692.

The previous prime is 6921451. The next prime is 6921493. The reversal of 6921481 is 1841296.

It is a happy number.

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 not a de Polignac number, because 6921481 - 2⁵ = 6921449 is a prime.

It is a super-2 number, since 2×6921481² = 95813798466722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921451) 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, 494385 + ... + 494398.

It is an arithmetic number, because the mean of its divisors is an integer number (1977568).

Almost surely, 2^6921481 is an apocalyptic number.

It is an amenable number.

6921481 is a deficient number, since it is larger than the sum of its proper divisors (988791).

6921481 is an equidigital number, since it uses as much as digits as its factorization.

6921481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988790.

The product of its digits is 3456, while the sum is 31.

The square root of 6921481 is about 2630.8707683959. The cubic root of 6921481 is about 190.5751822161.

The spelling of 6921481 in words is "six million, nine hundred twenty-one thousand, four hundred eighty-one".