131143404 has 72 divisors (see below), whose sum is σ = 357708288. Its totient is φ = 37285920.

The previous prime is 131143399. The next prime is 131143427. The reversal of 131143404 is 404341131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158937 + ... + 159759.

Almost surely, 2^131143404 is an apocalyptic number.

131143404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131143404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178854144).

131143404 is an abundant number, since it is smaller than the sum of its proper divisors (226564884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131143404 is a wasteful number, since it uses less digits than its factorization.

131143404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115 (or 1106 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 131143404 is about 11451.7860615714. The cubic root of 131143404 is about 508.0605617343.

Adding to 131143404 its reverse (404341131), we get a palindrome (535484535).

The spelling of 131143404 in words is "one hundred thirty-one million, one hundred forty-three thousand, four hundred four".