13491989 has 8 divisors (see below), whose sum is σ = 15951360. Its totient is φ = 11165616.

The previous prime is 13491983. The next prime is 13491997. The reversal of 13491989 is 98919431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-13491989 is a prime.

It is a super-2 number, since 2×13491989² = 364067534352242, 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 (13491983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33029 + ... + 33434.

It is an arithmetic number, because the mean of its divisors is an integer number (1993920).

Almost surely, 2^13491989 is an apocalyptic number.

It is an amenable number.

13491989 is a deficient number, since it is larger than the sum of its proper divisors (2459371).

13491989 is an equidigital number, since it uses as much as digits as its factorization.

13491989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66499.

The product of its digits is 69984, while the sum is 44.

The square root of 13491989 is about 3673.1442933814. The cubic root of 13491989 is about 238.0630496988.

The spelling of 13491989 in words is "thirteen million, four hundred ninety-one thousand, nine hundred eighty-nine".