131242321 has 16 divisors (see below), whose sum is σ = 153945088. Its totient is φ = 109544400.

The previous prime is 131242277. The next prime is 131242351. The reversal of 131242321 is 123242131.

It is a happy number.

It is not a de Polignac number, because 131242321 - 2¹⁹ = 130718033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131242351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189586 + ... + 190276.

It is an arithmetic number, because the mean of its divisors is an integer number (9621568).

Almost surely, 2^131242321 is an apocalyptic number.

It is an amenable number.

131242321 is a deficient number, since it is larger than the sum of its proper divisors (22702767).

131242321 is an equidigital number, since it uses as much as digits as its factorization.

131242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372.

The product of its digits is 288, while the sum is 19.

The square root of 131242321 is about 11456.1040934517. The cubic root of 131242321 is about 508.1882672203.

Adding to 131242321 its reverse (123242131), we get a palindrome (254484452).

The spelling of 131242321 in words is "one hundred thirty-one million, two hundred forty-two thousand, three hundred twenty-one".