1671090989 has 2 divisors, whose sum is σ = 1671090990. Its totient is φ = 1671090988.

The previous prime is 1671090937. The next prime is 1671091001. The reversal of 1671090989 is 9890901761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1330060900 + 341030089 = 36470^2 + 18467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671090989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671090389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835545494 + 835545495.

It is an arithmetic number, because the mean of its divisors is an integer number (835545495).

Almost surely, 2^1671090989 is an apocalyptic number.

It is an amenable number.

1671090989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671090989 is an equidigital number, since it uses as much as digits as its factorization.

1671090989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 1671090989 is about 40878.9797940213. The cubic root of 1671090989 is about 1186.6792973641.

The spelling of 1671090989 in words is "one billion, six hundred seventy-one million, ninety thousand, nine hundred eighty-nine".