11989669 has 2 divisors, whose sum is σ = 11989670. Its totient is φ = 11989668.

The previous prime is 11989657. The next prime is 11989687. The reversal of 11989669 is 96698911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11985444 + 4225 = 3462^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 11989669 - 2¹⁷ = 11858597 is a prime.

It is a super-2 number, since 2×11989669² = 287504325459122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11989169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994834 + 5994835.

It is an arithmetic number, because the mean of its divisors is an integer number (5994835).

Almost surely, 2^11989669 is an apocalyptic number.

It is an amenable number.

11989669 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989669 is an equidigital number, since it uses as much as digits as its factorization.

11989669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 49.

The square root of 11989669 is about 3462.6101426525. The cubic root of 11989669 is about 228.8771294095.

The spelling of 11989669 in words is "eleven million, nine hundred eighty-nine thousand, six hundred sixty-nine".