13491921 has 8 divisors (see below), whose sum is σ = 18089344. Its totient is φ = 8944560.

The previous prime is 13491893. The next prime is 13491937. The reversal of 13491921 is 12919431.

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

It is not a de Polignac number, because 13491921 - 2⁵ = 13491889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13491971) 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, 11881 + ... + 12966.

It is an arithmetic number, because the mean of its divisors is an integer number (2261168).

Almost surely, 2^13491921 is an apocalyptic number.

It is an amenable number.

13491921 is a deficient number, since it is larger than the sum of its proper divisors (4597423).

13491921 is a wasteful number, since it uses less digits than its factorization.

13491921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25031.

The product of its digits is 1944, while the sum is 30.

The square root of 13491921 is about 3673.1350369950. The cubic root of 13491921 is about 238.0626497500.

It can be divided in two parts, 134919 and 21, that added together give a triangular number (134940 = T₅₁₉).

The spelling of 13491921 in words is "thirteen million, four hundred ninety-one thousand, nine hundred twenty-one".