131402321 has 4 divisors (see below), whose sum is σ = 131745792. Its totient is φ = 131058852.

The previous prime is 131402291. The next prime is 131402351. The reversal of 131402321 is 123204131.

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 an interprime number because it is at equal distance from previous prime (131402291) and next prime (131402351).

It is a cyclic number.

It is not a de Polignac number, because 131402321 - 2¹⁰ = 131401297 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 131402321.

It is not an unprimeable number, because it can be changed into a prime (131402351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171161 + ... + 171926.

It is an arithmetic number, because the mean of its divisors is an integer number (32936448).

Almost surely, 2^131402321 is an apocalyptic number.

It is an amenable number.

131402321 is a deficient number, since it is larger than the sum of its proper divisors (343471).

131402321 is an equidigital number, since it uses as much as digits as its factorization.

131402321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343470.

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

The square root of 131402321 is about 11463.0851431890. The cubic root of 131402321 is about 508.3946973369.

Adding to 131402321 its reverse (123204131), we get a palindrome (254606452).

The spelling of 131402321 in words is "one hundred thirty-one million, four hundred two thousand, three hundred twenty-one".