12533691 has 4 divisors (see below), whose sum is σ = 16711592. Its totient is φ = 8355792.

The previous prime is 12533681. The next prime is 12533693. The reversal of 12533691 is 19633521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12533691 - 2¹¹ = 12531643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12533693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2088946 + ... + 2088951.

It is an arithmetic number, because the mean of its divisors is an integer number (4177898).

Almost surely, 2^12533691 is an apocalyptic number.

12533691 is a deficient number, since it is larger than the sum of its proper divisors (4177901).

12533691 is an equidigital number, since it uses as much as digits as its factorization.

12533691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177900.

The product of its digits is 4860, while the sum is 30.

The square root of 12533691 is about 3540.2953266641. The cubic root of 12533691 is about 232.2877609922.

The spelling of 12533691 in words is "twelve million, five hundred thirty-three thousand, six hundred ninety-one".