6942721 has 2 divisors, whose sum is σ = 6942722. Its totient is φ = 6942720.

The previous prime is 6942713. The next prime is 6942751. The reversal of 6942721 is 1272496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3841600 + 3101121 = 1960^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 6942721 - 2³ = 6942713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6942751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3471360 + 3471361.

It is an arithmetic number, because the mean of its divisors is an integer number (3471361).

It is a Proth number, since it is equal to 1695 ⋅ 2¹² + 1 and 1695 < 2¹².

Almost surely, 2^6942721 is an apocalyptic number.

It is an amenable number.

6942721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6942721 is an equidigital number, since it uses as much as digits as its factorization.

6942721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 6942721 is about 2634.9043625908. The cubic root of 6942721 is about 190.7699229752.

The spelling of 6942721 in words is "six million, nine hundred forty-two thousand, seven hundred twenty-one".