1329986989 has 2 divisors, whose sum is σ = 1329986990. Its totient is φ = 1329986988.

The previous prime is 1329986881. The next prime is 1329987031. The reversal of 1329986989 is 9896899231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1293481225 + 36505764 = 35965^2 + 6042^2 .

It is a cyclic number.

It is not a de Polignac number, because 1329986989 - 2¹¹ = 1329984941 is a prime.

It is a super-2 number, since 2×1329986989² = 3537730781818572242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1329986989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1329986089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664993494 + 664993495.

It is an arithmetic number, because the mean of its divisors is an integer number (664993495).

Almost surely, 2^1329986989 is an apocalyptic number.

It is an amenable number.

1329986989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1329986989 is an equidigital number, since it uses as much as digits as its factorization.

1329986989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 64.

The square root of 1329986989 is about 36468.9866736108. The cubic root of 1329986989 is about 1099.7208627806.

The spelling of 1329986989 in words is "one billion, three hundred twenty-nine million, nine hundred eighty-six thousand, nine hundred eighty-nine".