131665245 has 8 divisors (see below), whose sum is σ = 210664416. Its totient is φ = 70221456.

The previous prime is 131665243. The next prime is 131665291. The reversal of 131665245 is 542566131.

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

It is not a de Polignac number, because 131665245 - 2¹ = 131665243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131665243) 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, 4388827 + ... + 4388856.

It is an arithmetic number, because the mean of its divisors is an integer number (26333052).

Almost surely, 2^131665245 is an apocalyptic number.

131665245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131665245 is a deficient number, since it is larger than the sum of its proper divisors (78999171).

131665245 is an equidigital number, since it uses as much as digits as its factorization.

131665245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777691.

The product of its digits is 21600, while the sum is 33.

The square root of 131665245 is about 11474.5477035045. The cubic root of 131665245 is about 508.7335551595.

The spelling of 131665245 in words is "one hundred thirty-one million, six hundred sixty-five thousand, two hundred forty-five".