13500391 has 4 divisors (see below), whose sum is σ = 13599072. Its totient is φ = 13401712.

The previous prime is 13500373. The next prime is 13500419. The reversal of 13500391 is 19300531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19300531 = 401 ⋅48131.

It is a cyclic number.

It is not a de Polignac number, because 13500391 - 2⁹ = 13499879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13500491) 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, 49135 + ... + 49408.

It is an arithmetic number, because the mean of its divisors is an integer number (3399768).

Almost surely, 2^13500391 is an apocalyptic number.

13500391 is a deficient number, since it is larger than the sum of its proper divisors (98681).

13500391 is an equidigital number, since it uses as much as digits as its factorization.

13500391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98680.

The product of its (nonzero) digits is 405, while the sum is 22.

The square root of 13500391 is about 3674.2878221500. The cubic root of 13500391 is about 238.1124565649.

The spelling of 13500391 in words is "thirteen million, five hundred thousand, three hundred ninety-one".