2516191 has 4 divisors (see below), whose sum is σ = 2521384. Its totient is φ = 2511000.

The previous prime is 2516123. The next prime is 2516197. The reversal of 2516191 is 1916152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516191 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 (2516197) 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, 1785 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (630346).

2^2516191 is an apocalyptic number.

2516191 is a deficient number, since it is larger than the sum of its proper divisors (5193).

2516191 is an equidigital number, since it uses as much as digits as its factorization.

2516191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192.

The product of its digits is 540, while the sum is 25.

The square root of 2516191 is about 1586.2506107170. The cubic root of 2516191 is about 136.0132448173.

It can be divided in two parts, 25161 and 91, that added together give a palindrome (25252).

The spelling of 2516191 in words is "two million, five hundred sixteen thousand, one hundred ninety-one".