131210537 has 4 divisors (see below), whose sum is σ = 134410836. Its totient is φ = 128010240.

The previous prime is 131210533. The next prime is 131210543. The reversal of 131210537 is 735012131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11723776 + 119486761 = 3424^2 + 10931^2 .

It is a cyclic number.

It is not a de Polignac number, because 131210537 - 2² = 131210533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131210533) 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, 1600088 + ... + 1600169.

It is an arithmetic number, because the mean of its divisors is an integer number (33602709).

Almost surely, 2^131210537 is an apocalyptic number.

It is an amenable number.

131210537 is a deficient number, since it is larger than the sum of its proper divisors (3200299).

131210537 is an equidigital number, since it uses as much as digits as its factorization.

131210537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200298.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 131210537 is about 11454.7168013880. The cubic root of 131210537 is about 508.1472399058.

Adding to 131210537 its reverse (735012131), we get a palindrome (866222668).

The spelling of 131210537 in words is "one hundred thirty-one million, two hundred ten thousand, five hundred thirty-seven".