13121245 has 8 divisors (see below), whose sum is σ = 15812280. Its totient is φ = 10452480.

The previous prime is 13121243. The next prime is 13121257. The reversal of 13121245 is 54212131.

It can be written as a sum of positive squares in 4 ways, for example, as 290521 + 12830724 = 539^2 + 3582^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13121245 - 2¹ = 13121243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121243) 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 7 ways as a sum of consecutive naturals, for example, 4240 + ... + 6649.

It is an arithmetic number, because the mean of its divisors is an integer number (1976535).

Almost surely, 2^13121245 is an apocalyptic number.

It is an amenable number.

13121245 is a deficient number, since it is larger than the sum of its proper divisors (2691035).

13121245 is a wasteful number, since it uses less digits than its factorization.

13121245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11135.

The product of its digits is 240, while the sum is 19.

The square root of 13121245 is about 3622.3259102405. The cubic root of 13121245 is about 235.8622017072.

Adding to 13121245 its reverse (54212131), we get a palindrome (67333376).

It can be divided in two parts, 13121 and 245, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 13121245 in words is "thirteen million, one hundred twenty-one thousand, two hundred forty-five".