15669989 has 2 divisors, whose sum is σ = 15669990. Its totient is φ = 15669988.

The previous prime is 15669977. The next prime is 15670001. The reversal of 15669989 is 98996651.

It is a balanced prime because it is at equal distance from previous prime (15669977) and next prime (15670001).

It can be written as a sum of positive squares in only one way, i.e., 15665764 + 4225 = 3958^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 15669989 - 2¹² = 15665893 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15669989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15669919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7834994 + 7834995.

It is an arithmetic number, because the mean of its divisors is an integer number (7834995).

Almost surely, 2^15669989 is an apocalyptic number.

It is an amenable number.

15669989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15669989 is an equidigital number, since it uses as much as digits as its factorization.

15669989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 53.

The square root of 15669989 is about 3958.5336931748. The cubic root of 15669989 is about 250.2397114136.

The spelling of 15669989 in words is "fifteen million, six hundred sixty-nine thousand, nine hundred eighty-nine".