131631226 has 4 divisors (see below), whose sum is σ = 197446842. Its totient is φ = 65815612.

The previous prime is 131631223. The next prime is 131631257. The reversal of 131631226 is 622136131.

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

It can be written as a sum of positive squares in only one way, i.e., 103530625 + 28100601 = 10175^2 + 5301^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131631226.

It is not an unprimeable number, because it can be changed into a prime (131631223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32907805 + ... + 32907808.

Almost surely, 2^131631226 is an apocalyptic number.

131631226 is a deficient number, since it is larger than the sum of its proper divisors (65815616).

131631226 is an equidigital number, since it uses as much as digits as its factorization.

131631226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65815615.

The product of its digits is 1296, while the sum is 25.

The square root of 131631226 is about 11473.0652399435. The cubic root of 131631226 is about 508.6897367179.

Adding to 131631226 its reverse (622136131), we get a palindrome (753767357).

The spelling of 131631226 in words is "one hundred thirty-one million, six hundred thirty-one thousand, two hundred twenty-six".