6105721 has 2 divisors, whose sum is σ = 6105722. Its totient is φ = 6105720.

The previous prime is 6105719. The next prime is 6105727. The reversal of 6105721 is 1275016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5359225 + 746496 = 2315^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 6105721 - 2¹ = 6105719 is a prime.

Together with 6105719, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6105692 and 6105701.

It is not a weakly prime, because it can be changed into another prime (6105727) 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, 3052860 + 3052861.

It is an arithmetic number, because the mean of its divisors is an integer number (3052861).

Almost surely, 2^6105721 is an apocalyptic number.

It is an amenable number.

6105721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6105721 is an equidigital number, since it uses as much as digits as its factorization.

6105721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 6105721 is about 2470.9757182134. The cubic root of 6105721 is about 182.7731170576.

The spelling of 6105721 in words is "six million, one hundred five thousand, seven hundred twenty-one".