131788469 has 8 divisors (see below), whose sum is σ = 133332408. Its totient is φ = 130253760.

The previous prime is 131788457. The next prime is 131788519. The reversal of 131788469 is 964887131.

It can be written as a sum of positive squares in 4 ways, for example, as 81902500 + 49885969 = 9050^2 + 7063^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131788469 is a prime.

It is a super-2 number, since 2×131788469² = 34736401122727922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131788429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28799 + ... + 33059.

It is an arithmetic number, because the mean of its divisors is an integer number (16666551).

Almost surely, 2^131788469 is an apocalyptic number.

It is an amenable number.

131788469 is a deficient number, since it is larger than the sum of its proper divisors (1543939).

131788469 is a wasteful number, since it uses less digits than its factorization.

131788469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615.

The product of its digits is 290304, while the sum is 47.

The square root of 131788469 is about 11479.9158969045. The cubic root of 131788469 is about 508.8922116508.

The spelling of 131788469 in words is "one hundred thirty-one million, seven hundred eighty-eight thousand, four hundred sixty-nine".