13122257 has 4 divisors (see below), whose sum is σ = 13257636. Its totient is φ = 12986880.

The previous prime is 13122253. The next prime is 13122289. The reversal of 13122257 is 75222131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75222131 = 1117 ⋅67343.

It can be written as a sum of positive squares in 2 ways, for example, as 8473921 + 4648336 = 2911^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 13122257 - 2² = 13122253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13122251) 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 3 ways as a sum of consecutive naturals, for example, 67544 + ... + 67737.

It is an arithmetic number, because the mean of its divisors is an integer number (3314409).

Almost surely, 2^13122257 is an apocalyptic number.

It is an amenable number.

13122257 is a deficient number, since it is larger than the sum of its proper divisors (135379).

13122257 is an equidigital number, since it uses as much as digits as its factorization.

13122257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135378.

The product of its digits is 840, while the sum is 23.

The square root of 13122257 is about 3622.4655968001. The cubic root of 13122257 is about 235.8682653191.

Adding to 13122257 its reverse (75222131), we get a palindrome (88344388).

The spelling of 13122257 in words is "thirteen million, one hundred twenty-two thousand, two hundred fifty-seven".