131605097245 has 4 divisors (see below), whose sum is σ = 157926116700. Its totient is φ = 105284077792.

The previous prime is 131605097237. The next prime is 131605097257. The reversal of 131605097245 is 542790506131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542790506131 = 47 ⋅11548734173.

It can be written as a sum of positive squares in 2 ways, for example, as 32116582521 + 99488514724 = 179211^2 + 315418^2 .

It is a cyclic number.

It is not a de Polignac number, because 131605097245 - 2³ = 131605097237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13160509720 + ... + 13160509729.

It is an arithmetic number, because the mean of its divisors is an integer number (39481529175).

Almost surely, 2^131605097245 is an apocalyptic number.

It is an amenable number.

131605097245 is a deficient number, since it is larger than the sum of its proper divisors (26321019455).

131605097245 is an equidigital number, since it uses as much as digits as its factorization.

131605097245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26321019454.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 131605097245 in words is "one hundred thirty-one billion, six hundred five million, ninety-seven thousand, two hundred forty-five".