826996721 has 2 divisors, whose sum is σ = 826996722. Its totient is φ = 826996720.

The previous prime is 826996697. The next prime is 826996733. The reversal of 826996721 is 127699628.

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., 798853696 + 28143025 = 28264^2 + 5305^2 .

It is a cyclic number.

It is not a de Polignac number, because 826996721 - 2²⁶ = 759887857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 826996721.

It is not a weakly prime, because it can be changed into another prime (826996321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413498360 + 413498361.

It is an arithmetic number, because the mean of its divisors is an integer number (413498361).

Almost surely, 2^826996721 is an apocalyptic number.

It is an amenable number.

826996721 is a deficient number, since it is larger than the sum of its proper divisors (1).

826996721 is an equidigital number, since it uses as much as digits as its factorization.

826996721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 826996721 is about 28757.5506780393. The cubic root of 826996721 is about 938.6447653937.

The spelling of 826996721 in words is "eight hundred twenty-six million, nine hundred ninety-six thousand, seven hundred twenty-one".