131642321 has 4 divisors (see below), whose sum is σ = 131667312. Its totient is φ = 131617332.

The previous prime is 131642309. The next prime is 131642327. The reversal of 131642321 is 123246131.

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 131642321 - 2¹⁰ = 131641297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131642327) 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, 1175 + ... + 16268.

It is an arithmetic number, because the mean of its divisors is an integer number (32916828).

Almost surely, 2^131642321 is an apocalyptic number.

It is an amenable number.

131642321 is a deficient number, since it is larger than the sum of its proper divisors (24991).

131642321 is an equidigital number, since it uses as much as digits as its factorization.

131642321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24990.

The product of its digits is 864, while the sum is 23.

The square root of 131642321 is about 11473.5487535461. The cubic root of 131642321 is about 508.7040285498.

Adding to 131642321 its reverse (123246131), we get a palindrome (254888452).

The spelling of 131642321 in words is "one hundred thirty-one million, six hundred forty-two thousand, three hundred twenty-one".