1272091271 has 32 divisors (see below), whose sum is σ = 1446197760. Its totient is φ = 1118388480.

The previous prime is 1272091253. The next prime is 1272091277. The reversal of 1272091271 is 1721902721.

It is not a de Polignac number, because 1272091271 - 2⁶ = 1272091207 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 (1272091277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7617230 + ... + 7617396.

It is an arithmetic number, because the mean of its divisors is an integer number (45193680).

Almost surely, 2^1272091271 is an apocalyptic number.

1272091271 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1272091271 is a deficient number, since it is larger than the sum of its proper divisors (174106489).

1272091271 is an equidigital number, since it uses as much as digits as its factorization.

1272091271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 1272091271 is about 35666.3885331835. The cubic root of 1272091271 is about 1083.5262175109.

Adding to 1272091271 its reverse (1721902721), we get a palindrome (2993993992).

The spelling of 1272091271 in words is "one billion, two hundred seventy-two million, ninety-one thousand, two hundred seventy-one".