12511989 has 20 divisors (see below), whose sum is σ = 21361824. Its totient is φ = 7149384.

The previous prime is 12511969. The next prime is 12511991. The reversal of 12511989 is 98911521.

It is not a de Polignac number, because 12511989 - 2¹³ = 12503797 is a prime.

It is a super-3 number, since 3×12511989³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12511909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10467 + ... + 11600.

Almost surely, 2^12511989 is an apocalyptic number.

It is an amenable number.

12511989 is a deficient number, since it is larger than the sum of its proper divisors (8849835).

12511989 is an equidigital number, since it uses as much as digits as its factorization.

12511989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22086 (or 22077 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 12511989 is about 3537.2290002204. The cubic root of 12511989 is about 232.1536153166.

It can be divided in two parts, 1251 and 1989, that added together give a triangular number (3240 = T₈₀).

The spelling of 12511989 in words is "twelve million, five hundred eleven thousand, nine hundred eighty-nine".