6945121 has 2 divisors, whose sum is σ = 6945122. Its totient is φ = 6945120.

The previous prime is 6945119. The next prime is 6945131. The reversal of 6945121 is 1215496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6305121 + 640000 = 2511^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 6945121 - 2¹ = 6945119 is a prime.

Together with 6945119, it forms a pair of twin primes.

6945121 is a lucky number.

It is equal to p₄₇₃₁₄₉ and since 6945121 and 473149 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6945121.

It is not a weakly prime, because it can be changed into another prime (6945131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3472560 + 3472561.

It is an arithmetic number, because the mean of its divisors is an integer number (3472561).

Almost surely, 2^6945121 is an apocalyptic number.

It is an amenable number.

6945121 is a deficient number, since it is larger than the sum of its proper divisors (1).

6945121 is an equidigital number, since it uses as much as digits as its factorization.

6945121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6945121 is about 2635.3597477384. The cubic root of 6945121 is about 190.7919025933.

The spelling of 6945121 in words is "six million, nine hundred forty-five thousand, one hundred twenty-one".