671042987 has 2 divisors, whose sum is σ = 671042988. Its totient is φ = 671042986.

The previous prime is 671042971. The next prime is 671043047. The reversal of 671042987 is 789240176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 671042987 - 2⁴ = 671042971 is a prime.

It is not a weakly prime, because it can be changed into another prime (671042947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335521493 + 335521494.

It is an arithmetic number, because the mean of its divisors is an integer number (335521494).

Almost surely, 2^671042987 is an apocalyptic number.

671042987 is a deficient number, since it is larger than the sum of its proper divisors (1).

671042987 is an equidigital number, since it uses as much as digits as its factorization.

671042987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 671042987 is about 25904.4974280529. The cubic root of 671042987 is about 875.4878311569.

The spelling of 671042987 in words is "six hundred seventy-one million, forty-two thousand, nine hundred eighty-seven".