1673279989 has 2 divisors, whose sum is σ = 1673279990. Its totient is φ = 1673279988.

The previous prime is 1673279977. The next prime is 1673280053. The reversal of 1673279989 is 9899723761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652422500 + 20857489 = 40650^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673279989 - 2⁵ = 1673279957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1673279789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836639994 + 836639995.

It is an arithmetic number, because the mean of its divisors is an integer number (836639995).

Almost surely, 2^1673279989 is an apocalyptic number.

It is an amenable number.

1673279989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673279989 is an equidigital number, since it uses as much as digits as its factorization.

1673279989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 61.

The square root of 1673279989 is about 40905.7451832869. The cubic root of 1673279989 is about 1187.1972239936.

It can be divided in two parts, 16732 and 79989, that added together give a square (96721 = 311²).

The spelling of 1673279989 in words is "one billion, six hundred seventy-three million, two hundred seventy-nine thousand, nine hundred eighty-nine".