131121635345 has 4 divisors (see below), whose sum is σ = 157345962420. Its totient is φ = 104897308272.

The previous prime is 131121635339. The next prime is 131121635353. The reversal of 131121635345 is 543536121131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543536121131 = 107 ⋅5079776833.

It can be written as a sum of positive squares in 2 ways, for example, as 48469985281 + 82651650064 = 220159^2 + 287492^2 .

It is a cyclic number.

It is not a de Polignac number, because 131121635345 - 2⁸ = 131121635089 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 13112163530 + ... + 13112163539.

It is an arithmetic number, because the mean of its divisors is an integer number (39336490605).

Almost surely, 2^131121635345 is an apocalyptic number.

It is an amenable number.

131121635345 is a deficient number, since it is larger than the sum of its proper divisors (26224327075).

131121635345 is an equidigital number, since it uses as much as digits as its factorization.

131121635345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26224327074.

The product of its digits is 32400, while the sum is 35.

Adding to 131121635345 its reverse (543536121131), we get a palindrome (674657756476).

The spelling of 131121635345 in words is "one hundred thirty-one billion, one hundred twenty-one million, six hundred thirty-five thousand, three hundred forty-five".