131323021 has 4 divisors (see below), whose sum is σ = 131500512. Its totient is φ = 131145532.

The previous prime is 131323013. The next prime is 131323051. The reversal of 131323021 is 120323131.

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 131323021 - 2³ = 131323013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131322986 and 131323004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131323051) 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, 87631 + ... + 89116.

It is an arithmetic number, because the mean of its divisors is an integer number (32875128).

Almost surely, 2^131323021 is an apocalyptic number.

It is an amenable number.

131323021 is a deficient number, since it is larger than the sum of its proper divisors (177491).

131323021 is an equidigital number, since it uses as much as digits as its factorization.

131323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177490.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131323021 is about 11459.6256919674. The cubic root of 131323021 is about 508.2924063678.

Adding to 131323021 its reverse (120323131), we get a palindrome (251646152).

The spelling of 131323021 in words is "one hundred thirty-one million, three hundred twenty-three thousand, twenty-one".