827067991 has 2 divisors, whose sum is σ = 827067992. Its totient is φ = 827067990.

The previous prime is 827067979. The next prime is 827068013. The reversal of 827067991 is 199760728.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 827067991 - 2⁷ = 827067863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827067961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413533995 + 413533996.

It is an arithmetic number, because the mean of its divisors is an integer number (413533996).

Almost surely, 2^827067991 is an apocalyptic number.

827067991 is a deficient number, since it is larger than the sum of its proper divisors (1).

827067991 is an equidigital number, since it uses as much as digits as its factorization.

827067991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 827067991 is about 28758.7898041625. The cubic root of 827067991 is about 938.6717285360.

The spelling of 827067991 in words is "eight hundred twenty-seven million, sixty-seven thousand, nine hundred ninety-one".