7081391 has 4 divisors (see below), whose sum is σ = 7090512. Its totient is φ = 7072272.

The previous prime is 7081387. The next prime is 7081411. The reversal of 7081391 is 1931807.

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 7081391 - 2² = 7081387 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 (7081351) 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, 3275 + ... + 4988.

It is an arithmetic number, because the mean of its divisors is an integer number (1772628).

Almost surely, 2^7081391 is an apocalyptic number.

7081391 is a deficient number, since it is larger than the sum of its proper divisors (9121).

7081391 is an equidigital number, since it uses as much as digits as its factorization.

7081391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 7081391 is about 2661.0883111990. The cubic root of 7081391 is about 192.0316697614.

The spelling of 7081391 in words is "seven million, eighty-one thousand, three hundred ninety-one".