13121191 has 4 divisors (see below), whose sum is σ = 13811800. Its totient is φ = 12430584.

The previous prime is 13121159. The next prime is 13121203. The reversal of 13121191 is 19112131.

13121191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13121191 - 2⁵ = 13121159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 690589 = 13121191 / (1 + 3 + 1 + 2 + 1 + 1 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345276 + ... + 345313.

It is an arithmetic number, because the mean of its divisors is an integer number (3452950).

Almost surely, 2^13121191 is an apocalyptic number.

13121191 is a deficient number, since it is larger than the sum of its proper divisors (690609).

13121191 is an equidigital number, since it uses as much as digits as its factorization.

13121191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690608.

The product of its digits is 54, while the sum is 19.

The square root of 13121191 is about 3622.3184564585. The cubic root of 13121191 is about 235.8618781460.

The spelling of 13121191 in words is "thirteen million, one hundred twenty-one thousand, one hundred ninety-one".