131581227 has 4 divisors (see below), whose sum is σ = 175441640. Its totient is φ = 87720816.

The previous prime is 131581223. The next prime is 131581273. The reversal of 131581227 is 722185131.

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

It is not a de Polignac number, because 131581227 - 2² = 131581223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131581194 and 131581203.

It is not an unprimeable number, because it can be changed into a prime (131581223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21930202 + ... + 21930207.

It is an arithmetic number, because the mean of its divisors is an integer number (43860410).

Almost surely, 2^131581227 is an apocalyptic number.

131581227 is a deficient number, since it is larger than the sum of its proper divisors (43860413).

131581227 is an equidigital number, since it uses as much as digits as its factorization.

131581227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43860412.

The product of its digits is 3360, while the sum is 30.

The square root of 131581227 is about 11470.8860599345. The cubic root of 131581227 is about 508.6253214068.

The spelling of 131581227 in words is "one hundred thirty-one million, five hundred eighty-one thousand, two hundred twenty-seven".