131122611545 has 4 divisors (see below), whose sum is σ = 157347133860. Its totient is φ = 104898089232.

The previous prime is 131122611541. The next prime is 131122611559. The reversal of 131122611545 is 545116221131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46834586569 + 84288024976 = 216413^2 + 290324^2 .

It is a cyclic number.

It is not a de Polignac number, because 131122611545 - 2² = 131122611541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131122611541) 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, 13112261150 + ... + 13112261159.

It is an arithmetic number, because the mean of its divisors is an integer number (39336783465).

Almost surely, 2^131122611545 is an apocalyptic number.

It is an amenable number.

131122611545 is a deficient number, since it is larger than the sum of its proper divisors (26224522315).

131122611545 is an equidigital number, since it uses as much as digits as its factorization.

131122611545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26224522314.

The product of its digits is 7200, while the sum is 32.

Adding to 131122611545 its reverse (545116221131), we get a palindrome (676238832676).

The spelling of 131122611545 in words is "one hundred thirty-one billion, one hundred twenty-two million, six hundred eleven thousand, five hundred forty-five".