7991271 has 8 divisors (see below), whose sum is σ = 11838960. Its totient is φ = 5327496.

The previous prime is 7991257. The next prime is 7991303. The reversal of 7991271 is 1721997.

It is not a de Polignac number, because 7991271 - 2⁵ = 7991239 is a prime.

7991271 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147960 + ... + 148013.

It is an arithmetic number, because the mean of its divisors is an integer number (1479870).

Almost surely, 2^7991271 is an apocalyptic number.

7991271 is a deficient number, since it is larger than the sum of its proper divisors (3847689).

7991271 is a wasteful number, since it uses less digits than its factorization.

7991271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295982 (or 295976 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 7991271 is about 2826.8836198188. The cubic root of 7991271 is about 199.9272318605.

The spelling of 7991271 in words is "seven million, nine hundred ninety-one thousand, two hundred seventy-one".