6921451 has 2 divisors, whose sum is σ = 6921452. Its totient is φ = 6921450.

The previous prime is 6921449. The next prime is 6921493. The reversal of 6921451 is 1541296.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6921451 - 2¹ = 6921449 is a prime.

Together with 6921449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6924451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460725 + 3460726.

It is an arithmetic number, because the mean of its divisors is an integer number (3460726).

Almost surely, 2^6921451 is an apocalyptic number.

6921451 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921451 is an equidigital number, since it uses as much as digits as its factorization.

6921451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 6921451 is about 2630.8650668554. The cubic root of 6921451 is about 190.5749068769.

The spelling of 6921451 in words is "six million, nine hundred twenty-one thousand, four hundred fifty-one".