15191 has 4 divisors (see below), whose sum is σ = 16584. Its totient is φ = 13800.

The previous prime is 15187. The next prime is 15193. The reversal of 15191 is 19151.

15191 = 15² + 16² + ... + 36².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19151 = 11 ⋅1741.

It is a cyclic number.

It is not a de Polignac number, because 15191 - 2² = 15187 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15193) 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, 680 + ... + 701.

It is an arithmetic number, because the mean of its divisors is an integer number (4146).

2¹⁵¹⁹¹ is an apocalyptic number.

15191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15191 is a deficient number, since it is larger than the sum of its proper divisors (1393).

15191 is a wasteful number, since it uses less digits than its factorization.

15191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392.

The product of its digits is 45, while the sum is 17.

The square root of 15191 is about 123.2517748351. The cubic root of 15191 is about 24.7663565655.

It can be divided in two parts, 151 and 91, that added together give a palindrome (242).

The spelling of 15191 in words is "fifteen thousand, one hundred ninety-one".