2131538537 has 4 divisors (see below), whose sum is σ = 2131821636. Its totient is φ = 2131255440.

The previous prime is 2131538531. The next prime is 2131538543. The reversal of 2131538537 is 7358351312.

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

It is an interprime number because it is at equal distance from previous prime (2131538531) and next prime (2131538543).

It can be written as a sum of positive squares in 2 ways, for example, as 995781136 + 1135757401 = 31556^2 + 33701^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131538537 - 2⁶ = 2131538473 is a prime.

It is a super-2 number, since 2×2131538537² = 9086913069432200738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2131538537.

It is not an unprimeable number, because it can be changed into a prime (2131538531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129938 + ... + 145419.

It is an arithmetic number, because the mean of its divisors is an integer number (532955409).

Almost surely, 2^2131538537 is an apocalyptic number.

It is an amenable number.

2131538537 is a deficient number, since it is larger than the sum of its proper divisors (283099).

2131538537 is an equidigital number, since it uses as much as digits as its factorization.

2131538537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283098.

The product of its digits is 75600, while the sum is 38.

The square root of 2131538537 is about 46168.5882067018. The cubic root of 2131538537 is about 1286.9580663509.

Adding to 2131538537 its reverse (7358351312), we get a palindrome (9489889849).

The spelling of 2131538537 in words is "two billion, one hundred thirty-one million, five hundred thirty-eight thousand, five hundred thirty-seven".