671278877 has 2 divisors, whose sum is σ = 671278878. Its totient is φ = 671278876.

The previous prime is 671278849. The next prime is 671278889. The reversal of 671278877 is 778872176.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 576528121 + 94750756 = 24011^2 + 9734^2 .

It is a cyclic number.

It is not a de Polignac number, because 671278877 - 2¹² = 671274781 is a prime.

It is a super-2 number, since 2×671278877² = 901230661412762258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671278177) 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, 335639438 + 335639439.

It is an arithmetic number, because the mean of its divisors is an integer number (335639439).

Almost surely, 2^671278877 is an apocalyptic number.

It is an amenable number.

671278877 is a deficient number, since it is larger than the sum of its proper divisors (1).

671278877 is an equidigital number, since it uses as much as digits as its factorization.

671278877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1843968, while the sum is 53.

The square root of 671278877 is about 25909.0500983730. The cubic root of 671278877 is about 875.5904051271.

The spelling of 671278877 in words is "six hundred seventy-one million, two hundred seventy-eight thousand, eight hundred seventy-seven".