72191 has 4 divisors (see below), whose sum is σ = 82512. Its totient is φ = 61872.
The previous prime is 72173. The next prime is 72211. The reversal of 72191 is 19127.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19127 = 31 ⋅617.
It is a cyclic number.
It is not a de Polignac number, because 72191 - 210 = 71167 is a prime.
It is a Duffinian number.
It is a plaindrome in base 16.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 72191.
It is not an unprimeable number, because it can be changed into a prime (72101) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5150 + ... + 5163.
It is an arithmetic number, because the mean of its divisors is an integer number (20628).
272191 is an apocalyptic number.
72191 is a deficient number, since it is larger than the sum of its proper divisors (10321).
72191 is a wasteful number, since it uses less digits than its factorization.
72191 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10320.
The product of its digits is 126, while the sum is 20.
The square root of 72191 is about 268.6838290631. The cubic root of 72191 is about 41.6384306476.
The spelling of 72191 in words is "seventy-two thousand, one hundred ninety-one".
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