131443399 has 4 divisors (see below), whose sum is σ = 135975960. Its totient is φ = 126910840.

The previous prime is 131443397. The next prime is 131443409. The reversal of 131443399 is 993344131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993344131 = 13 ⋅76411087.

It is a cyclic number.

It is not a de Polignac number, because 131443399 - 2¹ = 131443397 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 (131443397) 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, 2266237 + ... + 2266294.

It is an arithmetic number, because the mean of its divisors is an integer number (33993990).

Almost surely, 2^131443399 is an apocalyptic number.

131443399 is a deficient number, since it is larger than the sum of its proper divisors (4532561).

131443399 is an equidigital number, since it uses as much as digits as its factorization.

131443399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532560.

The product of its digits is 34992, while the sum is 37.

The square root of 131443399 is about 11464.8767546799. The cubic root of 131443399 is about 508.4476686528.

The spelling of 131443399 in words is "one hundred thirty-one million, four hundred forty-three thousand, three hundred ninety-nine".