12781949849 has 2 divisors, whose sum is σ = 12781949850. Its totient is φ = 12781949848.

The previous prime is 12781949837. The next prime is 12781949861. The reversal of 12781949849 is 94894918721.

It is a balanced prime because it is at equal distance from previous prime (12781949837) and next prime (12781949861).

It can be written as a sum of positive squares in only one way, i.e., 6691240000 + 6090709849 = 81800^2 + 78043^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781949849 - 2⁴ = 12781949833 is a prime.

It is a super-2 number, since 2×12781949849² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12781949791 and 12781949800.

It is not a weakly prime, because it can be changed into another prime (12781949879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390974924 + 6390974925.

It is an arithmetic number, because the mean of its divisors is an integer number (6390974925).

Almost surely, 2^12781949849 is an apocalyptic number.

It is an amenable number.

12781949849 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781949849 is an equidigital number, since it uses as much as digits as its factorization.

12781949849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 62.

The spelling of 12781949849 in words is "twelve billion, seven hundred eighty-one million, nine hundred forty-nine thousand, eight hundred forty-nine".