131228736 has 28 divisors (see below), whose sum is σ = 347209872. Its totient is φ = 43742848.

The previous prime is 131228723. The next prime is 131228737. The reversal of 131228736 is 637822131.

It is a junction number, because it is equal to n+sod(n) for n = 131228697 and 131228706.

It is not an unprimeable number, because it can be changed into a prime (131228737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341550 + ... + 341933.

Almost surely, 2^131228736 is an apocalyptic number.

131228736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

131228736 is an abundant number, since it is smaller than the sum of its proper divisors (215981136).

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

131228736 is an equidigital number, since it uses as much as digits as its factorization.

131228736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683498 (or 683488 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 131228736 is about 11455.5111627548. The cubic root of 131228736 is about 508.1707322876.

The spelling of 131228736 in words is "one hundred thirty-one million, two hundred twenty-eight thousand, seven hundred thirty-six".