1271399533 has 8 divisors (see below), whose sum is σ = 1306708128. Its totient is φ = 1236351984.

The previous prime is 1271399477. The next prime is 1271399537. The reversal of 1271399533 is 3359931721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271399533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1271399533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271399537) 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 7 ways as a sum of consecutive naturals, for example, 55366 + ... + 74887.

It is an arithmetic number, because the mean of its divisors is an integer number (163338516).

Almost surely, 2^1271399533 is an apocalyptic number.

It is an amenable number.

1271399533 is a deficient number, since it is larger than the sum of its proper divisors (35308595).

1271399533 is a wasteful number, since it uses less digits than its factorization.

1271399533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130523.

The product of its digits is 153090, while the sum is 43.

The square root of 1271399533 is about 35656.6898772166. The cubic root of 1271399533 is about 1083.3297818792.

The spelling of 1271399533 in words is "one billion, two hundred seventy-one million, three hundred ninety-nine thousand, five hundred thirty-three".