1271885887 has 8 divisors (see below), whose sum is σ = 1344938112. Its totient is φ = 1200835200.

The previous prime is 1271885837. The next prime is 1271885899. The reversal of 1271885887 is 7885881721.

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

It is a cyclic number.

It is not a de Polignac number, because 1271885887 - 2⁷ = 1271885759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271885837) 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 in 7 ways as a sum of consecutive naturals, for example, 499078 + ... + 501619.

It is an arithmetic number, because the mean of its divisors is an integer number (168117264).

Almost surely, 2^1271885887 is an apocalyptic number.

1271885887 is a deficient number, since it is larger than the sum of its proper divisors (73052225).

1271885887 is a wasteful number, since it uses less digits than its factorization.

1271885887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000769.

The product of its digits is 2007040, while the sum is 55.

The square root of 1271885887 is about 35663.5091795521. The cubic root of 1271885887 is about 1083.4679012220.

The spelling of 1271885887 in words is "one billion, two hundred seventy-one million, eight hundred eighty-five thousand, eight hundred eighty-seven".