131423021 has 4 divisors (see below), whose sum is σ = 131601600. Its totient is φ = 131244444.

The previous prime is 131423011. The next prime is 131423023. The reversal of 131423021 is 120324131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120324131 = 19 ⋅6332849.

It is a cyclic number.

It is not a de Polignac number, because 131423021 - 2⁶ = 131422957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131423023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88181 + ... + 89658.

It is an arithmetic number, because the mean of its divisors is an integer number (32900400).

Almost surely, 2^131423021 is an apocalyptic number.

It is an amenable number.

131423021 is a deficient number, since it is larger than the sum of its proper divisors (178579).

131423021 is an equidigital number, since it uses as much as digits as its factorization.

131423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178578.

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

The square root of 131423021 is about 11463.9880059253. The cubic root of 131423021 is about 508.4213919889.

Adding to 131423021 its reverse (120324131), we get a palindrome (251747152).

The spelling of 131423021 in words is "one hundred thirty-one million, four hundred twenty-three thousand, twenty-one".