671717149 has 2 divisors, whose sum is σ = 671717150. Its totient is φ = 671717148.

The previous prime is 671717113. The next prime is 671717153. The reversal of 671717149 is 941717176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409860025 + 261857124 = 20245^2 + 16182^2 .

It is a cyclic number.

It is not a de Polignac number, because 671717149 - 2²³ = 663328541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671747149) 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, 335858574 + 335858575.

It is an arithmetic number, because the mean of its divisors is an integer number (335858575).

Almost surely, 2^671717149 is an apocalyptic number.

It is an amenable number.

671717149 is a deficient number, since it is larger than the sum of its proper divisors (1).

671717149 is an equidigital number, since it uses as much as digits as its factorization.

671717149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 43.

The square root of 671717149 is about 25917.5066123267. The cubic root of 671717149 is about 875.7809187306.

The spelling of 671717149 in words is "six hundred seventy-one million, seven hundred seventeen thousand, one hundred forty-nine".