13033991 has 8 divisors (see below), whose sum is σ = 13248144. Its totient is φ = 12821760.

The previous prime is 13033957. The next prime is 13034009. The reversal of 13033991 is 19933031.

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

It is a cyclic number.

It is not a de Polignac number, because 13033991 - 2⁶ = 13033927 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13033901) 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 7 ways as a sum of consecutive naturals, for example, 19031 + ... + 19703.

It is an arithmetic number, because the mean of its divisors is an integer number (1656018).

Almost surely, 2^13033991 is an apocalyptic number.

13033991 is a deficient number, since it is larger than the sum of its proper divisors (214153).

13033991 is a wasteful number, since it uses less digits than its factorization.

13033991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 13033991 is about 3610.2619018570. The cubic root of 13033991 is about 235.3382243087.

The spelling of 13033991 in words is "thirteen million, thirty-three thousand, nine hundred ninety-one".