1271921608 has 8 divisors (see below), whose sum is σ = 2384853030. Its totient is φ = 635960800.

The previous prime is 1271921543. The next prime is 1271921641. The reversal of 1271921608 is 8061291721.

It can be written as a sum of positive squares in only one way, i.e., 1072038564 + 199883044 = 32742^2 + 14138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79495093 + ... + 79495108.

Almost surely, 2^1271921608 is an apocalyptic number.

It is an amenable number.

1271921608 is a deficient number, since it is larger than the sum of its proper divisors (1112931422).

1271921608 is a wasteful number, since it uses less digits than its factorization.

1271921608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158990207 (or 158990203 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1271921608 is about 35664.0099820533. The cubic root of 1271921608 is about 1083.4780442164.

The spelling of 1271921608 in words is "one billion, two hundred seventy-one million, nine hundred twenty-one thousand, six hundred eight".