671720107 has 2 divisors, whose sum is σ = 671720108. Its totient is φ = 671720106.

The previous prime is 671720081. The next prime is 671720117. The reversal of 671720107 is 701027176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671720107 - 2¹⁵ = 671687339 is a prime.

It is not a weakly prime, because it can be changed into another prime (671720117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335860053 + 335860054.

It is an arithmetic number, because the mean of its divisors is an integer number (335860054).

Almost surely, 2^671720107 is an apocalyptic number.

671720107 is a deficient number, since it is larger than the sum of its proper divisors (1).

671720107 is an equidigital number, since it uses as much as digits as its factorization.

671720107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 671720107 is about 25917.5636779386. The cubic root of 671720107 is about 875.7822042698.

The spelling of 671720107 in words is "six hundred seventy-one million, seven hundred twenty thousand, one hundred seven".