131806555 has 4 divisors (see below), whose sum is σ = 158167872. Its totient is φ = 105445240.

The previous prime is 131806511. The next prime is 131806561. The reversal of 131806555 is 555608131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131806555 - 2⁷ = 131806427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131806555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13180651 + ... + 13180660.

It is an arithmetic number, because the mean of its divisors is an integer number (39541968).

Almost surely, 2^131806555 is an apocalyptic number.

131806555 is a deficient number, since it is larger than the sum of its proper divisors (26361317).

131806555 is an equidigital number, since it uses as much as digits as its factorization.

131806555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26361316.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 131806555 is about 11480.7035934214. The cubic root of 131806555 is about 508.9154898723.

The spelling of 131806555 in words is "one hundred thirty-one million, eight hundred six thousand, five hundred fifty-five".