671607217 has 2 divisors, whose sum is σ = 671607218. Its totient is φ = 671607216.

The previous prime is 671607191. The next prime is 671607241. The reversal of 671607217 is 712706176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 589324176 + 82283041 = 24276^2 + 9071^2 .

It is a cyclic number.

It is not a de Polignac number, because 671607217 - 2²³ = 663218609 is a prime.

It is not a weakly prime, because it can be changed into another prime (671607817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335803608 + 335803609.

It is an arithmetic number, because the mean of its divisors is an integer number (335803609).

Almost surely, 2^671607217 is an apocalyptic number.

It is an amenable number.

671607217 is a deficient number, since it is larger than the sum of its proper divisors (1).

671607217 is an equidigital number, since it uses as much as digits as its factorization.

671607217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 671607217 is about 25915.3857196840. The cubic root of 671607217 is about 875.7331398896.

The spelling of 671607217 in words is "six hundred seventy-one million, six hundred seven thousand, two hundred seventeen".