671138141 has 2 divisors, whose sum is σ = 671138142. Its totient is φ = 671138140.

The previous prime is 671138131. The next prime is 671138161. The reversal of 671138141 is 141831176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603734041 + 67404100 = 24571^2 + 8210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671138141 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 671138098 and 671138107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671138131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335569070 + 335569071.

It is an arithmetic number, because the mean of its divisors is an integer number (335569071).

Almost surely, 2^671138141 is an apocalyptic number.

It is an amenable number.

671138141 is a deficient number, since it is larger than the sum of its proper divisors (1).

671138141 is an equidigital number, since it uses as much as digits as its factorization.

671138141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 671138141 is about 25906.3339938325. Note that the first 3 decimals coincide. The cubic root of 671138141 is about 875.5292106380.

The spelling of 671138141 in words is "six hundred seventy-one million, one hundred thirty-eight thousand, one hundred forty-one".