6241721 has 2 divisors, whose sum is σ = 6241722. Its totient is φ = 6241720.

The previous prime is 6241693. The next prime is 6241723. The reversal of 6241721 is 1271426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4644025 + 1597696 = 2155^2 + 1264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6241721 is a prime.

Together with 6241723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6241723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3120860 + 3120861.

It is an arithmetic number, because the mean of its divisors is an integer number (3120861).

Almost surely, 2^6241721 is an apocalyptic number.

It is an amenable number.

6241721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6241721 is an equidigital number, since it uses as much as digits as its factorization.

6241721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 6241721 is about 2498.3436513018. The cubic root of 6241721 is about 184.1202054016.

The spelling of 6241721 in words is "six million, two hundred forty-one thousand, seven hundred twenty-one".