131128537 has 4 divisors (see below), whose sum is σ = 134326836. Its totient is φ = 127930240.

The previous prime is 131128507. The next prime is 131128541. The reversal of 131128537 is 735821131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735821131 = 107 ⋅6876833.

It can be written as a sum of positive squares in 2 ways, for example, as 6046681 + 125081856 = 2459^2 + 11184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131128537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131128499 and 131128508.

It is not an unprimeable number, because it can be changed into a prime (131128507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1599088 + ... + 1599169.

It is an arithmetic number, because the mean of its divisors is an integer number (33581709).

Almost surely, 2^131128537 is an apocalyptic number.

It is an amenable number.

131128537 is a deficient number, since it is larger than the sum of its proper divisors (3198299).

131128537 is an equidigital number, since it uses as much as digits as its factorization.

131128537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198298.

The product of its digits is 5040, while the sum is 31.

The square root of 131128537 is about 11451.1369304537. The cubic root of 131128537 is about 508.0413623398.

Adding to 131128537 its reverse (735821131), we get a palindrome (866949668).

The spelling of 131128537 in words is "one hundred thirty-one million, one hundred twenty-eight thousand, five hundred thirty-seven".