671548957 has 2 divisors, whose sum is σ = 671548958. Its totient is φ = 671548956.

The previous prime is 671548937. The next prime is 671548981. The reversal of 671548957 is 759845176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636098841 + 35450116 = 25221^2 + 5954^2 .

It is a cyclic number.

It is not a de Polignac number, because 671548957 - 2¹⁵ = 671516189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671548937) 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, 335774478 + 335774479.

It is an arithmetic number, because the mean of its divisors is an integer number (335774479).

Almost surely, 2^671548957 is an apocalyptic number.

It is an amenable number.

671548957 is a deficient number, since it is larger than the sum of its proper divisors (1).

671548957 is an equidigital number, since it uses as much as digits as its factorization.

671548957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 52.

The square root of 671548957 is about 25914.2616526113. The cubic root of 671548957 is about 875.7078167112.

The spelling of 671548957 in words is "six hundred seventy-one million, five hundred forty-eight thousand, nine hundred fifty-seven".