1271664909 has 24 divisors (see below), whose sum is σ = 1848154880. Its totient is φ = 842578848.

The previous prime is 1271664907. The next prime is 1271664931. The reversal of 1271664909 is 9094661721.

It is not a de Polignac number, because 1271664909 - 2¹ = 1271664907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271664907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1449579 + ... + 1450455.

Almost surely, 2^1271664909 is an apocalyptic number.

It is an amenable number.

1271664909 is a deficient number, since it is larger than the sum of its proper divisors (576489971).

1271664909 is a wasteful number, since it uses less digits than its factorization.

1271664909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1271664909 is about 35660.4109482771. The cubic root of 1271664909 is about 1083.4051501949.

The spelling of 1271664909 in words is "one billion, two hundred seventy-one million, six hundred sixty-four thousand, nine hundred nine".