12492191 has 4 divisors (see below), whose sum is σ = 12650400. Its totient is φ = 12333984.

The previous prime is 12492187. The next prime is 12492209. The reversal of 12492191 is 19129421.

12492191 = 358² + 359² + ... + 436².

12492191 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19129421 = 1621 ⋅11801.

It is a cyclic number.

It is not a de Polignac number, because 12492191 - 2² = 12492187 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 (12492131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78986 + ... + 79143.

It is an arithmetic number, because the mean of its divisors is an integer number (3162600).

Almost surely, 2^12492191 is an apocalyptic number.

12492191 is a deficient number, since it is larger than the sum of its proper divisors (158209).

12492191 is an equidigital number, since it uses as much as digits as its factorization.

12492191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158208.

The product of its digits is 1296, while the sum is 29.

The square root of 12492191 is about 3534.4293740291. The cubic root of 12492191 is about 232.0311033903.

The spelling of 12492191 in words is "twelve million, four hundred ninety-two thousand, one hundred ninety-one".