131020243 has 4 divisors (see below), whose sum is σ = 131542488. Its totient is φ = 130498000.

The previous prime is 131020237. The next prime is 131020247. The reversal of 131020243 is 342020131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131020243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131020247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260746 + ... + 261247.

It is an arithmetic number, because the mean of its divisors is an integer number (32885622).

Almost surely, 2^131020243 is an apocalyptic number.

131020243 is a deficient number, since it is larger than the sum of its proper divisors (522245).

131020243 is an equidigital number, since it uses as much as digits as its factorization.

131020243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522244.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 131020243 is about 11446.4074276604. The cubic root of 131020243 is about 507.9014665673.

Adding to 131020243 its reverse (342020131), we get a palindrome (473040374).

The spelling of 131020243 in words is "one hundred thirty-one million, twenty thousand, two hundred forty-three".