671408069 has 2 divisors, whose sum is σ = 671408070. Its totient is φ = 671408068.

The previous prime is 671408033. The next prime is 671408071. The reversal of 671408069 is 960804176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468203044 + 203205025 = 21638^2 + 14255^2 .

It is a cyclic number.

It is not a de Polignac number, because 671408069 - 2⁸ = 671407813 is a prime.

It is a super-2 number, since 2×671408069² = 901577590236617522, which contains 22 as substring.

Together with 671408071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671408009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335704034 + 335704035.

It is an arithmetic number, because the mean of its divisors is an integer number (335704035).

Almost surely, 2^671408069 is an apocalyptic number.

It is an amenable number.

671408069 is a deficient number, since it is larger than the sum of its proper divisors (1).

671408069 is an equidigital number, since it uses as much as digits as its factorization.

671408069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 671408069 is about 25911.5431613017. The cubic root of 671408069 is about 875.6465725529.

The spelling of 671408069 in words is "six hundred seventy-one million, four hundred eight thousand, sixty-nine".