131233320 has 48 divisors (see below), whose sum is σ = 426509460. Its totient is φ = 34995456.

The previous prime is 131233309. The next prime is 131233321. The reversal of 131233320 is 23332131.

131233320 is a `hidden beast` number, since 1 + 312 + 33 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 131194116 + 39204 = 11454^2 + 198^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 131233293 and 131233302.

It is not an unprimeable number, because it can be changed into a prime (131233321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181909 + ... + 182628.

Almost surely, 2^131233320 is an apocalyptic number.

131233320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131233320 is an abundant number, since it is smaller than the sum of its proper divisors (295276140).

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

131233320 is a wasteful number, since it uses less digits than its factorization.

131233320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364554 (or 364547 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 131233320 is about 11455.7112393775. The cubic root of 131233320 is about 508.1766492526.

Adding to 131233320 its reverse (23332131), we get a palindrome (154565451).

The spelling of 131233320 in words is "one hundred thirty-one million, two hundred thirty-three thousand, three hundred twenty".