131643249 has 4 divisors (see below), whose sum is σ = 175524336. Its totient is φ = 87762164.

The previous prime is 131643241. The next prime is 131643289. The reversal of 131643249 is 942346131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 942346131 = 3 ⋅314115377.

It is a cyclic number.

It is not a de Polignac number, because 131643249 - 2³ = 131643241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131643241) 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, 21940539 + ... + 21940544.

It is an arithmetic number, because the mean of its divisors is an integer number (43881084).

Almost surely, 2^131643249 is an apocalyptic number.

It is an amenable number.

131643249 is a deficient number, since it is larger than the sum of its proper divisors (43881087).

131643249 is an equidigital number, since it uses as much as digits as its factorization.

131643249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43881086.

The product of its digits is 15552, while the sum is 33.

The square root of 131643249 is about 11473.5891943193. The cubic root of 131643249 is about 508.7052239005.

The spelling of 131643249 in words is "one hundred thirty-one million, six hundred forty-three thousand, two hundred forty-nine".