6723121 has 2 divisors, whose sum is σ = 6723122. Its totient is φ = 6723120.

The previous prime is 6723113. The next prime is 6723127. The reversal of 6723121 is 1213276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5948721 + 774400 = 2439^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 6723121 - 2³ = 6723113 is a prime.

6723121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6723092 and 6723101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6723127) 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 as a sum of consecutive naturals, namely, 3361560 + 3361561.

It is an arithmetic number, because the mean of its divisors is an integer number (3361561).

Almost surely, 2^6723121 is an apocalyptic number.

It is an amenable number.

6723121 is a deficient number, since it is larger than the sum of its proper divisors (1).

6723121 is an equidigital number, since it uses as much as digits as its factorization.

6723121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 6723121 is about 2592.8981854288. The cubic root of 6723121 is about 188.7369688239.

Adding to 6723121 its reverse (1213276), we get a palindrome (7936397).

The spelling of 6723121 in words is "six million, seven hundred twenty-three thousand, one hundred twenty-one".