671875949 has 2 divisors, whose sum is σ = 671875950. Its totient is φ = 671875948.

The previous prime is 671875907. The next prime is 671875957. The reversal of 671875949 is 949578176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671742724 + 133225 = 25918^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 671875949 - 2⁸ = 671875693 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 671875894 and 671875903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671875969) 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, 335937974 + 335937975.

It is an arithmetic number, because the mean of its divisors is an integer number (335937975).

Almost surely, 2^671875949 is an apocalyptic number.

It is an amenable number.

671875949 is a deficient number, since it is larger than the sum of its proper divisors (1).

671875949 is an equidigital number, since it uses as much as digits as its factorization.

671875949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The square root of 671875949 is about 25920.5699975907. The cubic root of 671875949 is about 875.8499274654.

The spelling of 671875949 in words is "six hundred seventy-one million, eight hundred seventy-five thousand, nine hundred forty-nine".