1271328949 has 4 divisors (see below), whose sum is σ = 1386904320. Its totient is φ = 1155753580.

The previous prime is 1271328923. The next prime is 1271328983. The reversal of 1271328949 is 9498231721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1271328949 - 2¹⁷ = 1271197877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1271328899 and 1271328908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271328349) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 57787669 + ... + 57787690.

It is an arithmetic number, because the mean of its divisors is an integer number (346726080).

Almost surely, 2^1271328949 is an apocalyptic number.

It is an amenable number.

1271328949 is a deficient number, since it is larger than the sum of its proper divisors (115575371).

1271328949 is a wasteful number, since it uses less digits than its factorization.

1271328949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115575370.

The product of its digits is 217728, while the sum is 46.

The square root of 1271328949 is about 35655.7000912898. The cubic root of 1271328949 is about 1083.3097338501.

The spelling of 1271328949 in words is "one billion, two hundred seventy-one million, three hundred twenty-eight thousand, nine hundred forty-nine".