131530237 has 4 divisors (see below), whose sum is σ = 131616700. Its totient is φ = 131443776.

The previous prime is 131530229. The next prime is 131530247. The reversal of 131530237 is 732035131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 732035131 = 113 ⋅6478187.

It can be written as a sum of positive squares in 2 ways, for example, as 35117476 + 96412761 = 5926^2 + 9819^2 .

It is a cyclic number.

It is not a de Polignac number, because 131530237 - 2³ = 131530229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131530247) 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, 40908 + ... + 44005.

It is an arithmetic number, because the mean of its divisors is an integer number (32904175).

Almost surely, 2^131530237 is an apocalyptic number.

It is an amenable number.

131530237 is a deficient number, since it is larger than the sum of its proper divisors (86463).

131530237 is an equidigital number, since it uses as much as digits as its factorization.

131530237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86462.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 131530237 is about 11468.6632612524. The cubic root of 131530237 is about 508.5596125502.

Adding to 131530237 its reverse (732035131), we get a palindrome (863565368).

The spelling of 131530237 in words is "one hundred thirty-one million, five hundred thirty thousand, two hundred thirty-seven".