834787721 has 2 divisors, whose sum is σ = 834787722. Its totient is φ = 834787720.

The previous prime is 834787699. The next prime is 834787739. The reversal of 834787721 is 127787438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825757696 + 9030025 = 28736^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 834787721 - 2¹⁰ = 834786697 is a prime.

It is not a weakly prime, because it can be changed into another prime (834787741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417393860 + 417393861.

It is an arithmetic number, because the mean of its divisors is an integer number (417393861).

Almost surely, 2^834787721 is an apocalyptic number.

It is an amenable number.

834787721 is a deficient number, since it is larger than the sum of its proper divisors (1).

834787721 is an equidigital number, since it uses as much as digits as its factorization.

834787721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 47.

The square root of 834787721 is about 28892.6932112602. The cubic root of 834787721 is about 941.5831631839.

The spelling of 834787721 in words is "eight hundred thirty-four million, seven hundred eighty-seven thousand, seven hundred twenty-one".