1271126605 has 16 divisors (see below), whose sum is σ = 1760189184. Its totient is φ = 863164800.

The previous prime is 1271126587. The next prime is 1271126627. The reversal of 1271126605 is 5066211721.

It is not a de Polignac number, because 1271126605 - 2¹⁷ = 1270995533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172696 + ... + 179905.

It is an arithmetic number, because the mean of its divisors is an integer number (110011824).

Almost surely, 2^1271126605 is an apocalyptic number.

It is an amenable number.

1271126605 is a deficient number, since it is larger than the sum of its proper divisors (489062579).

1271126605 is a wasteful number, since it uses less digits than its factorization.

1271126605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352716.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1271126605 is about 35652.8625077987. The cubic root of 1271126605 is about 1083.2522578116.

The spelling of 1271126605 in words is "one billion, two hundred seventy-one million, one hundred twenty-six thousand, six hundred five".