12781049 has 2 divisors, whose sum is σ = 12781050. Its totient is φ = 12781048.

The previous prime is 12781009. The next prime is 12781063. The reversal of 12781049 is 94018721.

12781049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 71824 = 3565^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781049 - 2²⁰ = 11732473 is a prime.

It is a Chen prime.

It is equal to p₈₃₅₉₄₃ and since 12781049 and 835943 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12781009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390524 + 6390525.

It is an arithmetic number, because the mean of its divisors is an integer number (6390525).

Almost surely, 2^12781049 is an apocalyptic number.

It is an amenable number.

12781049 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781049 is an equidigital number, since it uses as much as digits as its factorization.

12781049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 12781049 is about 3575.0593002075. The cubic root of 12781049 is about 233.8059181614.

The spelling of 12781049 in words is "twelve million, seven hundred eighty-one thousand, forty-nine".