846541721 has 2 divisors, whose sum is σ = 846541722. Its totient is φ = 846541720.

The previous prime is 846541711. The next prime is 846541723. The reversal of 846541721 is 127145648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825930121 + 20611600 = 28739^2 + 4540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-846541721 is a prime.

Together with 846541723, 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 (846541723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423270860 + 423270861.

It is an arithmetic number, because the mean of its divisors is an integer number (423270861).

Almost surely, 2^846541721 is an apocalyptic number.

It is an amenable number.

846541721 is a deficient number, since it is larger than the sum of its proper divisors (1).

846541721 is an equidigital number, since it uses as much as digits as its factorization.

846541721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 846541721 is about 29095.3900300374. The cubic root of 846541721 is about 945.9818173109.

The spelling of 846541721 in words is "eight hundred forty-six million, five hundred forty-one thousand, seven hundred twenty-one".