13193991 has 24 divisors (see below), whose sum is σ = 19750016. Its totient is φ = 8482320.

The previous prime is 13193987. The next prime is 13194007. The reversal of 13193991 is 19939131.

It is not a de Polignac number, because 13193991 - 2² = 13193987 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13193951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39696 + ... + 40026.

Almost surely, 2^13193991 is an apocalyptic number.

13193991 is a deficient number, since it is larger than the sum of its proper divisors (6556025).

13193991 is a wasteful number, since it uses less digits than its factorization.

13193991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 480 counting only the distinct ones).

The product of its digits is 6561, while the sum is 36.

The square root of 13193991 is about 3632.3533693736. The cubic root of 13193991 is about 236.2972828852.

The spelling of 13193991 in words is "thirteen million, one hundred ninety-three thousand, nine hundred ninety-one".