827605991 has 2 divisors, whose sum is σ = 827605992. Its totient is φ = 827605990.

The previous prime is 827605969. The next prime is 827606027. The reversal of 827605991 is 199506728.

827605991 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-827605991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827605091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413802995 + 413802996.

It is an arithmetic number, because the mean of its divisors is an integer number (413802996).

Almost surely, 2^827605991 is an apocalyptic number.

827605991 is a deficient number, since it is larger than the sum of its proper divisors (1).

827605991 is an equidigital number, since it uses as much as digits as its factorization.

827605991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 827605991 is about 28768.1419455619. The cubic root of 827605991 is about 938.8752168161.

The spelling of 827605991 in words is "eight hundred twenty-seven million, six hundred five thousand, nine hundred ninety-one".