13121243 has 2 divisors, whose sum is σ = 13121244. Its totient is φ = 13121242.

The previous prime is 13121231. The next prime is 13121257. The reversal of 13121243 is 34212131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13121243 - 2¹² = 13117147 is a prime.

It is not a weakly prime, because it can be changed into another prime (13121203) 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 as a sum of consecutive naturals, namely, 6560621 + 6560622.

It is an arithmetic number, because the mean of its divisors is an integer number (6560622).

Almost surely, 2^13121243 is an apocalyptic number.

13121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121243 is an equidigital number, since it uses as much as digits as its factorization.

13121243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 13121243 is about 3622.3256341748. The cubic root of 13121243 is about 235.8621897235.

Adding to 13121243 its reverse (34212131), we get a palindrome (47333374).

The spelling of 13121243 in words is "thirteen million, one hundred twenty-one thousand, two hundred forty-three".