13121437 has 4 divisors (see below), whose sum is σ = 14995936. Its totient is φ = 11246940.

The previous prime is 13121429. The next prime is 13121441. The reversal of 13121437 is 73412131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73412131 = 13 ⋅5647087.

It is a cyclic number.

It is not a de Polignac number, because 13121437 - 2³ = 13121429 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 (13121417) 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, 937239 + ... + 937252.

It is an arithmetic number, because the mean of its divisors is an integer number (3748984).

Almost surely, 2^13121437 is an apocalyptic number.

It is an amenable number.

13121437 is a deficient number, since it is larger than the sum of its proper divisors (1874499).

13121437 is an equidigital number, since it uses as much as digits as its factorization.

13121437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874498.

The product of its digits is 504, while the sum is 22.

The square root of 13121437 is about 3622.3524124524. The cubic root of 13121437 is about 235.8633521397.

Adding to 13121437 its reverse (73412131), we get a palindrome (86533568).

The spelling of 13121437 in words is "thirteen million, one hundred twenty-one thousand, four hundred thirty-seven".