13191989 has 4 divisors (see below), whose sum is σ = 13199424. Its totient is φ = 13184556.

The previous prime is 13191979. The next prime is 13191991. The reversal of 13191989 is 98919131.

It is a happy number.

13191989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13191989 is a prime.

It is a super-2 number, since 2×13191989² = 348057147552242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13191929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674 + ... + 5180.

It is an arithmetic number, because the mean of its divisors is an integer number (3299856).

Almost surely, 2^13191989 is an apocalyptic number.

It is an amenable number.

13191989 is a deficient number, since it is larger than the sum of its proper divisors (7435).

13191989 is an equidigital number, since it uses as much as digits as its factorization.

13191989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7434.

The product of its digits is 17496, while the sum is 41.

The square root of 13191989 is about 3632.0777800042. The cubic root of 13191989 is about 236.2853306996.

The spelling of 13191989 in words is "thirteen million, one hundred ninety-one thousand, nine hundred eighty-nine".