131122505 has 4 divisors (see below), whose sum is σ = 157347012. Its totient is φ = 104898000.

The previous prime is 131122501. The next prime is 131122507. The reversal of 131122505 is 505221131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505221131 = 277 ⋅1823903.

It can be written as a sum of positive squares in 2 ways, for example, as 57214096 + 73908409 = 7564^2 + 8597^2 .

It is not a de Polignac number, because 131122505 - 2² = 131122501 is a prime.

It is a super-2 number, since 2×131122505² = 34386222634950050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131122501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13112246 + ... + 13112255.

It is an arithmetic number, because the mean of its divisors is an integer number (39336753).

Almost surely, 2^131122505 is an apocalyptic number.

It is an amenable number.

131122505 is a deficient number, since it is larger than the sum of its proper divisors (26224507).

131122505 is an equidigital number, since it uses as much as digits as its factorization.

131122505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26224506.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 131122505 is about 11450.8735474635. The cubic root of 131122505 is about 508.0335721401.

Adding to 131122505 its reverse (505221131), we get a palindrome (636343636).

The spelling of 131122505 in words is "one hundred thirty-one million, one hundred twenty-two thousand, five hundred five".