6921493 has 2 divisors, whose sum is σ = 6921494. Its totient is φ = 6921492.

The previous prime is 6921451. The next prime is 6921503. The reversal of 6921493 is 3941296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5793649 + 1127844 = 2407^2 + 1062^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921493 - 2¹³ = 6913301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6921403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460746 + 3460747.

It is an arithmetic number, because the mean of its divisors is an integer number (3460747).

Almost surely, 2^6921493 is an apocalyptic number.

It is an amenable number.

6921493 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921493 is an equidigital number, since it uses as much as digits as its factorization.

6921493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 6921493 is about 2630.8730490086. The cubic root of 6921493 is about 190.5752923515.

The spelling of 6921493 in words is "six million, nine hundred twenty-one thousand, four hundred ninety-three".