7271891 has 8 divisors (see below), whose sum is σ = 8045568. Its totient is φ = 6517000.

The previous prime is 7271881. The next prime is 7271897. The reversal of 7271891 is 1981727.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7271891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7271897) 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, 3875 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (1005696).

Almost surely, 2^7271891 is an apocalyptic number.

7271891 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

7271891 is a deficient number, since it is larger than the sum of its proper divisors (773677).

7271891 is a wasteful number, since it uses less digits than its factorization.

7271891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9393.

The product of its digits is 7056, while the sum is 35.

The square root of 7271891 is about 2696.6443962822. The cubic root of 7271891 is about 193.7384348282.

The spelling of 7271891 in words is "seven million, two hundred seventy-one thousand, eight hundred ninety-one".