131155605 has 72 divisors (see below), whose sum is σ = 274371552. Its totient is φ = 59929632.

The previous prime is 131155601. The next prime is 131155631. The reversal of 131155605 is 506551131.

131155605 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 55 + 605 = 666.

It is not a de Polignac number, because 131155605 - 2² = 131155601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131155601) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 58434 + ... + 60636.

It is an arithmetic number, because the mean of its divisors is an integer number (3810716).

Almost surely, 2^131155605 is an apocalyptic number.

131155605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131155605 is an abundant number, since it is smaller than the sum of its proper divisors (143215947).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131155605 is an equidigital number, since it uses as much as digits as its factorization.

131155605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237 (or 2218 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 131155605 is about 11452.3187608449. The cubic root of 131155605 is about 508.0763171452.

The spelling of 131155605 in words is "one hundred thirty-one million, one hundred fifty-five thousand, six hundred five".