131781263 has 4 divisors (see below), whose sum is σ = 139533120. Its totient is φ = 124029408.

The previous prime is 131781253. The next prime is 131781269. The reversal of 131781263 is 362187131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362187131 = 827 ⋅437953.

It is a cyclic number.

It is not a de Polignac number, because 131781263 - 2¹⁰ = 131780239 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 (131781269) 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, 3875903 + ... + 3875936.

It is an arithmetic number, because the mean of its divisors is an integer number (34883280).

Almost surely, 2^131781263 is an apocalyptic number.

131781263 is a deficient number, since it is larger than the sum of its proper divisors (7751857).

131781263 is an equidigital number, since it uses as much as digits as its factorization.

131781263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7751856.

The product of its digits is 6048, while the sum is 32.

The square root of 131781263 is about 11479.6020401406. The cubic root of 131781263 is about 508.8829363220.

It can be divided in two parts, 13178 and 1263, that added together give a palindrome (14441).

The spelling of 131781263 in words is "one hundred thirty-one million, seven hundred eighty-one thousand, two hundred sixty-three".