131333421 has 4 divisors (see below), whose sum is σ = 175111232. Its totient is φ = 87555612.

The previous prime is 131333413. The next prime is 131333437. The reversal of 131333421 is 124333131.

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 not a de Polignac number, because 131333421 - 2³ = 131333413 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 (131333401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21888901 + ... + 21888906.

It is an arithmetic number, because the mean of its divisors is an integer number (43777808).

Almost surely, 2^131333421 is an apocalyptic number.

It is an amenable number.

131333421 is a deficient number, since it is larger than the sum of its proper divisors (43777811).

131333421 is an equidigital number, since it uses as much as digits as its factorization.

131333421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43777810.

The product of its digits is 648, while the sum is 21.

The square root of 131333421 is about 11460.0794499864. The cubic root of 131333421 is about 508.3058239226.

Adding to 131333421 its reverse (124333131), we get a palindrome (255666552).

The spelling of 131333421 in words is "one hundred thirty-one million, three hundred thirty-three thousand, four hundred twenty-one".