131216809537 has 4 divisors (see below), whose sum is σ = 143145610416. Its totient is φ = 119288008660.

The previous prime is 131216809531. The next prime is 131216809543. The reversal of 131216809537 is 735908612131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (131216809531) and next prime (131216809543).

It is a cyclic number.

It is not a de Polignac number, because 131216809537 - 2³⁵ = 96857071169 is a prime.

It is a super-2 number, since 2×131216809537² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131216809531) 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, 5964400423 + ... + 5964400444.

It is an arithmetic number, because the mean of its divisors is an integer number (35786402604).

Almost surely, 2^131216809537 is an apocalyptic number.

It is an amenable number.

131216809537 is a deficient number, since it is larger than the sum of its proper divisors (11928800879).

131216809537 is a wasteful number, since it uses less digits than its factorization.

131216809537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11928800878.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 131216809537 in words is "one hundred thirty-one billion, two hundred sixteen million, eight hundred nine thousand, five hundred thirty-seven".