131287665 has 8 divisors (see below), whose sum is σ = 210060288. Its totient is φ = 70020080.

The previous prime is 131287661. The next prime is 131287687. The reversal of 131287665 is 566782131.

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

It is not a de Polignac number, because 131287665 - 2² = 131287661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131287661) 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, 4376241 + ... + 4376270.

It is an arithmetic number, because the mean of its divisors is an integer number (26257536).

Almost surely, 2^131287665 is an apocalyptic number.

131287665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131287665 is a deficient number, since it is larger than the sum of its proper divisors (78772623).

131287665 is an equidigital number, since it uses as much as digits as its factorization.

131287665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8752519.

The product of its digits is 60480, while the sum is 39.

The square root of 131287665 is about 11458.0829548402. The cubic root of 131287665 is about 508.2467865438.

The spelling of 131287665 in words is "one hundred thirty-one million, two hundred eighty-seven thousand, six hundred sixty-five".