671075681 has 2 divisors, whose sum is σ = 671075682. Its totient is φ = 671075680.

The previous prime is 671075653. The next prime is 671075683. The reversal of 671075681 is 186570176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 458645056 + 212430625 = 21416^2 + 14575^2 .

It is a cyclic number.

It is not a de Polignac number, because 671075681 - 2¹⁴ = 671059297 is a prime.

It is a super-2 number, since 2×671075681² = 900685139259227522, which contains 22 as substring.

Together with 671075683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671075683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335537840 + 335537841.

It is an arithmetic number, because the mean of its divisors is an integer number (335537841).

Almost surely, 2^671075681 is an apocalyptic number.

It is an amenable number.

671075681 is a deficient number, since it is larger than the sum of its proper divisors (1).

671075681 is an equidigital number, since it uses as much as digits as its factorization.

671075681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 671075681 is about 25905.1284690889. The cubic root of 671075681 is about 875.5020491900.

The spelling of 671075681 in words is "six hundred seventy-one million, seventy-five thousand, six hundred eighty-one".