12801989 has 2 divisors, whose sum is σ = 12801990. Its totient is φ = 12801988.

The previous prime is 12801983. The next prime is 12802033. The reversal of 12801989 is 98910821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7317025 + 5484964 = 2705^2 + 2342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12801989 is a prime.

It is a super-2 number, since 2×12801989² = 327781844712242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12801983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6400994 + 6400995.

It is an arithmetic number, because the mean of its divisors is an integer number (6400995).

Almost surely, 2^12801989 is an apocalyptic number.

It is an amenable number.

12801989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12801989 is an equidigital number, since it uses as much as digits as its factorization.

12801989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 12801989 is about 3577.9867244024. The cubic root of 12801989 is about 233.9335348280.

The spelling of 12801989 in words is "twelve million, eight hundred one thousand, nine hundred eighty-nine".