12787331 has 2 divisors, whose sum is σ = 12787332. Its totient is φ = 12787330.

The previous prime is 12787321. The next prime is 12787351. The reversal of 12787331 is 13378721.

It is a weak prime.

It is an emirp because it is prime and its reverse (13378721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12787331 - 2⁶ = 12787267 is a prime.

It is a super-2 number, since 2×12787331² = 327031668207122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12787301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6393665 + 6393666.

It is an arithmetic number, because the mean of its divisors is an integer number (6393666).

Almost surely, 2^12787331 is an apocalyptic number.

12787331 is a deficient number, since it is larger than the sum of its proper divisors (1).

12787331 is an equidigital number, since it uses as much as digits as its factorization.

12787331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 12787331 is about 3575.9377791007. The cubic root of 12787331 is about 233.8442177879.

The spelling of 12787331 in words is "twelve million, seven hundred eighty-seven thousand, three hundred thirty-one".