12581137 has 4 divisors (see below), whose sum is σ = 12888036. Its totient is φ = 12274240.

The previous prime is 12581123. The next prime is 12581183. The reversal of 12581137 is 73118521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73118521 = 7 ⋅10445503.

It can be written as a sum of positive squares in 2 ways, for example, as 254016 + 12327121 = 504^2 + 3511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12581137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12581117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153388 + ... + 153469.

It is an arithmetic number, because the mean of its divisors is an integer number (3222009).

Almost surely, 2^12581137 is an apocalyptic number.

It is an amenable number.

12581137 is a deficient number, since it is larger than the sum of its proper divisors (306899).

12581137 is an equidigital number, since it uses as much as digits as its factorization.

12581137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306898.

The product of its digits is 1680, while the sum is 28.

The square root of 12581137 is about 3546.9898505634. The cubic root of 12581137 is about 232.5804985835.

Adding to 12581137 its reverse (73118521), we get a palindrome (85699658).

The spelling of 12581137 in words is "twelve million, five hundred eighty-one thousand, one hundred thirty-seven".