131717989 has 8 divisors (see below), whose sum is σ = 150194520. Its totient is φ = 114433536.

The previous prime is 131717981. The next prime is 131718001. The reversal of 131717989 is 989717131.

It can be written as a sum of positive squares in 4 ways, for example, as 58752225 + 72965764 = 7665^2 + 8542^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131717989 - 2³ = 131717981 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 (131717981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297784 + ... + 298225.

It is an arithmetic number, because the mean of its divisors is an integer number (18774315).

Almost surely, 2^131717989 is an apocalyptic number.

It is an amenable number.

131717989 is a deficient number, since it is larger than the sum of its proper divisors (18476531).

131717989 is a wasteful number, since it uses less digits than its factorization.

131717989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596039.

The product of its digits is 95256, while the sum is 46.

The square root of 131717989 is about 11476.8457774774. The cubic root of 131717989 is about 508.8014775649.

It can be divided in two parts, 1317 and 17989, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 131717989 in words is "one hundred thirty-one million, seven hundred seventeen thousand, nine hundred eighty-nine".