6671989 has 2 divisors, whose sum is σ = 6671990. Its totient is φ = 6671988.

The previous prime is 6671969. The next prime is 6672013. The reversal of 6671989 is 9891766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6671889 + 100 = 2583^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 6671989 - 2⁵ = 6671957 is a prime.

It is a super-2 number, since 2×6671989² = 89030874432242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6671969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335994 + 3335995.

It is an arithmetic number, because the mean of its divisors is an integer number (3335995).

Almost surely, 2^6671989 is an apocalyptic number.

It is an amenable number.

6671989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671989 is an equidigital number, since it uses as much as digits as its factorization.

6671989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 6671989 is about 2583.0193572639. The cubic root of 6671989 is about 188.2572775279.

The spelling of 6671989 in words is "six million, six hundred seventy-one thousand, nine hundred eighty-nine".