671439047 has 2 divisors, whose sum is σ = 671439048. Its totient is φ = 671439046.

The previous prime is 671438993. The next prime is 671439049. The reversal of 671439047 is 740934176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671439047 - 2⁶ = 671438983 is a prime.

Together with 671439049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 671438995 and 671439013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671439049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335719523 + 335719524.

It is an arithmetic number, because the mean of its divisors is an integer number (335719524).

Almost surely, 2^671439047 is an apocalyptic number.

671439047 is a deficient number, since it is larger than the sum of its proper divisors (1).

671439047 is an equidigital number, since it uses as much as digits as its factorization.

671439047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 671439047 is about 25912.1409188820. The cubic root of 671439047 is about 875.6600394561.

The spelling of 671439047 in words is "six hundred seventy-one million, four hundred thirty-nine thousand, forty-seven".