131817646489 has 3 divisors (see below), whose sum is σ = 131818009557. Its totient is φ = 131817283422.

The previous prime is 131817646481. The next prime is 131817646537. The reversal of 131817646489 is 984646718131.

The square root of 131817646489 is 363067.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 131817646489 - 2³ = 131817646481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131817646481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 181534 + ... + 544600.

It is an arithmetic number, because the mean of its divisors is an integer number (43939336519).

Almost surely, 2^131817646489 is an apocalyptic number.

131817646489 is the 363067-th square number.

131817646489 is the 181534-th centered octagonal number.

It is an amenable number.

131817646489 is a deficient number, since it is larger than the sum of its proper divisors (363068).

131817646489 is an frugal number, since it uses more digits than its factorization.

131817646489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726134 (or 363067 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 131817646489 in words is "one hundred thirty-one billion, eight hundred seventeen million, six hundred forty-six thousand, four hundred eighty-nine".