4271991 has 4 divisors (see below), whose sum is σ = 5695992. Its totient is φ = 2847992.

The previous prime is 4271963. The next prime is 4272001. The reversal of 4271991 is 1991724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4271991 - 2⁹ = 4271479 is a prime.

It is a D-number.

4271991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4271591) 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 3 ways as a sum of consecutive naturals, for example, 711996 + ... + 712001.

It is an arithmetic number, because the mean of its divisors is an integer number (1423998).

Almost surely, 2^4271991 is an apocalyptic number.

4271991 is a deficient number, since it is larger than the sum of its proper divisors (1424001).

4271991 is a wasteful number, since it uses less digits than its factorization.

4271991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424000.

The product of its digits is 4536, while the sum is 33.

The square root of 4271991 is about 2066.8795320483. The cubic root of 4271991 is about 162.2594911522.

The spelling of 4271991 in words is "four million, two hundred seventy-one thousand, nine hundred ninety-one".