13122391 has 4 divisors (see below), whose sum is σ = 13135392. Its totient is φ = 13109392.

The previous prime is 13122379. The next prime is 13122409. The reversal of 13122391 is 19322131.

13122391 is digitally balanced in base 3, 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 13122391 - 2²¹ = 11025239 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 (13122341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4846 + ... + 7051.

It is an arithmetic number, because the mean of its divisors is an integer number (3283848).

Almost surely, 2^13122391 is an apocalyptic number.

13122391 is a deficient number, since it is larger than the sum of its proper divisors (13001).

13122391 is a wasteful number, since it uses less digits than its factorization.

13122391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13000.

The product of its digits is 324, while the sum is 22.

The square root of 13122391 is about 3622.4840924426. The cubic root of 13122391 is about 235.8690681850.

It can be divided in two parts, 131 and 22391, that added together give a palindrome (22522).

The spelling of 13122391 in words is "thirteen million, one hundred twenty-two thousand, three hundred ninety-one".