1271725849 has 2 divisors, whose sum is σ = 1271725850. Its totient is φ = 1271725848.

The previous prime is 1271725813. The next prime is 1271725891. The reversal of 1271725849 is 9485271721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 857318400 + 414407449 = 29280^2 + 20357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271725849 - 2²⁷ = 1137508121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1271725799 and 1271725808.

It is not a weakly prime, because it can be changed into another prime (1271225849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635862924 + 635862925.

It is an arithmetic number, because the mean of its divisors is an integer number (635862925).

Almost surely, 2^1271725849 is an apocalyptic number.

It is an amenable number.

1271725849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271725849 is an equidigital number, since it uses as much as digits as its factorization.

1271725849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 46.

The square root of 1271725849 is about 35661.2653869713. The cubic root of 1271725849 is about 1083.4224560263.

The spelling of 1271725849 in words is "one billion, two hundred seventy-one million, seven hundred twenty-five thousand, eight hundred forty-nine".