131640263 has 4 divisors (see below), whose sum is σ = 131695968. Its totient is φ = 131584560.

The previous prime is 131640259. The next prime is 131640343. The reversal of 131640263 is 362046131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362046131 = 5477 ⋅66103.

It is a cyclic number.

It is not a de Polignac number, because 131640263 - 2² = 131640259 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 (131640233) 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, 24143 + ... + 29088.

It is an arithmetic number, because the mean of its divisors is an integer number (32923992).

Almost surely, 2^131640263 is an apocalyptic number.

131640263 is a deficient number, since it is larger than the sum of its proper divisors (55705).

131640263 is an equidigital number, since it uses as much as digits as its factorization.

131640263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55704.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 131640263 is about 11473.4590686506. The cubic root of 131640263 is about 508.7013776334.

Adding to 131640263 its reverse (362046131), we get a palindrome (493686394).

The spelling of 131640263 in words is "one hundred thirty-one million, six hundred forty thousand, two hundred sixty-three".