671725331 has 2 divisors, whose sum is σ = 671725332. Its totient is φ = 671725330.

The previous prime is 671725321. The next prime is 671725333. The reversal of 671725331 is 133527176.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671725331 is a prime.

It is a super-2 number, since 2×671725331² = 902429840614119122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 671725333, 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 = 671725291 and 671725300.

It is not a weakly prime, because it can be changed into another prime (671725333) 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, 335862665 + 335862666.

It is an arithmetic number, because the mean of its divisors is an integer number (335862666).

Almost surely, 2^671725331 is an apocalyptic number.

671725331 is a deficient number, since it is larger than the sum of its proper divisors (1).

671725331 is an equidigital number, since it uses as much as digits as its factorization.

671725331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 35.

The square root of 671725331 is about 25917.6644588204. The cubic root of 671725331 is about 875.7844745975.

The spelling of 671725331 in words is "six hundred seventy-one million, seven hundred twenty-five thousand, three hundred thirty-one".