826639997 has 2 divisors, whose sum is σ = 826639998. Its totient is φ = 826639996.

The previous prime is 826639967. The next prime is 826640047. The reversal of 826639997 is 799936628.

826639997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 820593316 + 6046681 = 28646^2 + 2459^2 .

It is a cyclic number.

It is not a de Polignac number, because 826639997 - 2²⁰ = 825591421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (826639927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413319998 + 413319999.

It is an arithmetic number, because the mean of its divisors is an integer number (413319999).

Almost surely, 2^826639997 is an apocalyptic number.

It is an amenable number.

826639997 is a deficient number, since it is larger than the sum of its proper divisors (1).

826639997 is an equidigital number, since it uses as much as digits as its factorization.

826639997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 59.

The square root of 826639997 is about 28751.3477423233. The cubic root of 826639997 is about 938.5097849025.

The spelling of 826639997 in words is "eight hundred twenty-six million, six hundred thirty-nine thousand, nine hundred ninety-seven".