671747149 has 2 divisors, whose sum is σ = 671747150. Its totient is φ = 671747148.

The previous prime is 671747143. The next prime is 671747183. The reversal of 671747149 is 941747176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367488900 + 304258249 = 19170^2 + 17443^2 .

It is a cyclic number.

It is not a de Polignac number, because 671747149 - 2²³ = 663358541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671747099 and 671747108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671747143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335873574 + 335873575.

It is an arithmetic number, because the mean of its divisors is an integer number (335873575).

Almost surely, 2^671747149 is an apocalyptic number.

It is an amenable number.

671747149 is a deficient number, since it is larger than the sum of its proper divisors (1).

671747149 is an equidigital number, since it uses as much as digits as its factorization.

671747149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

The square root of 671747149 is about 25918.0853652425. The cubic root of 671747149 is about 875.7939564784.

The spelling of 671747149 in words is "six hundred seventy-one million, seven hundred forty-seven thousand, one hundred forty-nine".