12587381 has 2 divisors, whose sum is σ = 12587382. Its totient is φ = 12587380.

The previous prime is 12587303. The next prime is 12587401. The reversal of 12587381 is 18378521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 5564881 = 2650^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 12587381 - 2¹⁴ = 12570997 is a prime.

It is a super-2 number, since 2×12587381² = 316884320878322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12586381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6293690 + 6293691.

It is an arithmetic number, because the mean of its divisors is an integer number (6293691).

Almost surely, 2^12587381 is an apocalyptic number.

It is an amenable number.

12587381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12587381 is an equidigital number, since it uses as much as digits as its factorization.

12587381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 12587381 is about 3547.8699243349. The cubic root of 12587381 is about 232.6189686744.

The spelling of 12587381 in words is "twelve million, five hundred eighty-seven thousand, three hundred eighty-one".