12581537 has 2 divisors, whose sum is σ = 12581538. Its totient is φ = 12581536.

The previous prime is 12581519. The next prime is 12581551. The reversal of 12581537 is 73518521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7054336 + 5527201 = 2656^2 + 2351^2 .

It is an emirp because it is prime and its reverse (73518521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12581537 - 2⁶ = 12581473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12581557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6290768 + 6290769.

It is an arithmetic number, because the mean of its divisors is an integer number (6290769).

Almost surely, 2^12581537 is an apocalyptic number.

It is an amenable number.

12581537 is a deficient number, since it is larger than the sum of its proper divisors (1).

12581537 is an equidigital number, since it uses as much as digits as its factorization.

12581537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 12581537 is about 3547.0462359546. The cubic root of 12581537 is about 232.5829634167.

The spelling of 12581537 in words is "twelve million, five hundred eighty-one thousand, five hundred thirty-seven".