846768721 has 2 divisors, whose sum is σ = 846768722. Its totient is φ = 846768720.

The previous prime is 846768697. The next prime is 846768731. The reversal of 846768721 is 127867648.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668946496 + 177822225 = 25864^2 + 13335^2 .

It is a cyclic number.

It is not a de Polignac number, because 846768721 - 2¹⁹ = 846244433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (846768731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423384360 + 423384361.

It is an arithmetic number, because the mean of its divisors is an integer number (423384361).

Almost surely, 2^846768721 is an apocalyptic number.

It is an amenable number.

846768721 is a deficient number, since it is larger than the sum of its proper divisors (1).

846768721 is an equidigital number, since it uses as much as digits as its factorization.

846768721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 49.

The square root of 846768721 is about 29099.2907301879. The cubic root of 846768721 is about 946.0663647018.

The spelling of 846768721 in words is "eight hundred forty-six million, seven hundred sixty-eight thousand, seven hundred twenty-one".