131505243 has 16 divisors (see below), whose sum is σ = 180675360. Its totient is φ = 85040384.

The previous prime is 131505233. The next prime is 131505263. The reversal of 131505243 is 342505131.

It is a cyclic number.

It is not a de Polignac number, because 131505243 - 2⁵ = 131505211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131505233) 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 15 ways as a sum of consecutive naturals, for example, 9505 + ... + 18797.

It is an arithmetic number, because the mean of its divisors is an integer number (11292210).

Almost surely, 2^131505243 is an apocalyptic number.

131505243 is a deficient number, since it is larger than the sum of its proper divisors (49170117).

131505243 is an equidigital number, since it uses as much as digits as its factorization.

131505243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9438.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 131505243 is about 11467.5735445647. The cubic root of 131505243 is about 508.5273975390.

The spelling of 131505243 in words is "one hundred thirty-one million, five hundred five thousand, two hundred forty-three".