671111047 has 2 divisors, whose sum is σ = 671111048. Its totient is φ = 671111046.

The previous prime is 671111029. The next prime is 671111071. The reversal of 671111047 is 740111176.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671111047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671111647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335555523 + 335555524.

It is an arithmetic number, because the mean of its divisors is an integer number (335555524).

Almost surely, 2^671111047 is an apocalyptic number.

671111047 is a deficient number, since it is larger than the sum of its proper divisors (1).

671111047 is an equidigital number, since it uses as much as digits as its factorization.

671111047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 671111047 is about 25905.8110662453. The cubic root of 671111047 is about 875.5174287080.

The spelling of 671111047 in words is "six hundred seventy-one million, one hundred eleven thousand, forty-seven".