7161391 has 4 divisors (see below), whose sum is σ = 7166952. Its totient is φ = 7155832.

The previous prime is 7161379. The next prime is 7161421. The reversal of 7161391 is 1931617.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1931617 = 401 ⋅4817.

It is a cyclic number.

It is not a de Polignac number, because 7161391 - 2⁵ = 7161359 is a prime.

It is a Duffinian number.

7161391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7161331) 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, 261 + ... + 3793.

It is an arithmetic number, because the mean of its divisors is an integer number (1791738).

Almost surely, 2^7161391 is an apocalyptic number.

7161391 is the 1693-rd centered pentagonal number.

7161391 is a deficient number, since it is larger than the sum of its proper divisors (5561).

7161391 is a wasteful number, since it uses less digits than its factorization.

7161391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560.

The product of its digits is 1134, while the sum is 28.

The square root of 7161391 is about 2676.0775399827. The cubic root of 7161391 is about 192.7521046154.

The spelling of 7161391 in words is "seven million, one hundred sixty-one thousand, three hundred ninety-one".