671139827 has 2 divisors, whose sum is σ = 671139828. Its totient is φ = 671139826.

The previous prime is 671139817. The next prime is 671139857. The reversal of 671139827 is 728931176.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671139827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671139817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335569913 + 335569914.

It is an arithmetic number, because the mean of its divisors is an integer number (335569914).

Almost surely, 2^671139827 is an apocalyptic number.

671139827 is a deficient number, since it is larger than the sum of its proper divisors (1).

671139827 is an equidigital number, since it uses as much as digits as its factorization.

671139827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 671139827 is about 25906.3665341167. The cubic root of 671139827 is about 875.5299437910.

The spelling of 671139827 in words is "six hundred seventy-one million, one hundred thirty-nine thousand, eight hundred twenty-seven".