131228831 has 6 divisors (see below), whose sum is σ = 139402560. Its totient is φ = 123509216.

The previous prime is 131228791. The next prime is 131228837. The reversal of 131228831 is 138822131.

It is a de Polignac number, because none of the positive numbers 2^k-131228831 is a prime.

It is a super-2 number, since 2×131228831² = 34442012171253122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131228794 and 131228803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131228837) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 226751 + ... + 227328.

It is an arithmetic number, because the mean of its divisors is an integer number (23233760).

Almost surely, 2^131228831 is an apocalyptic number.

131228831 is a deficient number, since it is larger than the sum of its proper divisors (8173729).

131228831 is an equidigital number, since it uses as much as digits as its factorization.

131228831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454113 (or 454096 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 131228831 is about 11455.5153092299. The cubic root of 131228831 is about 508.1708549137.

The spelling of 131228831 in words is "one hundred thirty-one million, two hundred twenty-eight thousand, eight hundred thirty-one".