671724877 has 2 divisors, whose sum is σ = 671724878. Its totient is φ = 671724876.

The previous prime is 671724839. The next prime is 671724923. The reversal of 671724877 is 778427176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547045321 + 124679556 = 23389^2 + 11166^2 .

It is a cyclic number.

It is not a de Polignac number, because 671724877 - 2¹¹ = 671722829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671724877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671724827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335862438 + 335862439.

It is an arithmetic number, because the mean of its divisors is an integer number (335862439).

Almost surely, 2^671724877 is an apocalyptic number.

It is an amenable number.

671724877 is a deficient number, since it is larger than the sum of its proper divisors (1).

671724877 is an equidigital number, since it uses as much as digits as its factorization.

671724877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921984, while the sum is 49.

The square root of 671724877 is about 25917.6557003136. The cubic root of 671724877 is about 875.7842772916.

The spelling of 671724877 in words is "six hundred seventy-one million, seven hundred twenty-four thousand, eight hundred seventy-seven".