131042321 has 4 divisors (see below), whose sum is σ = 131526144. Its totient is φ = 130558500.

The previous prime is 131042299. The next prime is 131042347. The reversal of 131042321 is 123240131.

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.

It is a cyclic number.

It is not a de Polignac number, because 131042321 - 2²² = 126848017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131042321.

It is not an unprimeable number, because it can be changed into a prime (131042521) 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, 241505 + ... + 242046.

It is an arithmetic number, because the mean of its divisors is an integer number (32881536).

Almost surely, 2^131042321 is an apocalyptic number.

It is an amenable number.

131042321 is a deficient number, since it is larger than the sum of its proper divisors (483823).

131042321 is an equidigital number, since it uses as much as digits as its factorization.

131042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483822.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 131042321 is about 11447.3717944339. The cubic root of 131042321 is about 507.9299935047.

Adding to 131042321 its reverse (123240131), we get a palindrome (254282452).

The spelling of 131042321 in words is "one hundred thirty-one million, forty-two thousand, three hundred twenty-one".