671388253 has 2 divisors, whose sum is σ = 671388254. Its totient is φ = 671388252.

The previous prime is 671388247. The next prime is 671388281. The reversal of 671388253 is 352883176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397882809 + 273505444 = 19947^2 + 16538^2 .

It is a cyclic number.

It is not a de Polignac number, because 671388253 - 2²¹ = 669291101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671388203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335694126 + 335694127.

It is an arithmetic number, because the mean of its divisors is an integer number (335694127).

Almost surely, 2^671388253 is an apocalyptic number.

It is an amenable number.

671388253 is a deficient number, since it is larger than the sum of its proper divisors (1).

671388253 is an equidigital number, since it uses as much as digits as its factorization.

671388253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 671388253 is about 25911.1607806366. The cubic root of 671388253 is about 875.6379578301.

The spelling of 671388253 in words is "six hundred seventy-one million, three hundred eighty-eight thousand, two hundred fifty-three".