131242745 has 4 divisors (see below), whose sum is σ = 157491300. Its totient is φ = 104994192.

The previous prime is 131242739. The next prime is 131242757. The reversal of 131242745 is 547242131.

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 47831056 + 83411689 = 6916^2 + 9133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131242745 is a prime.

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, 13124270 + ... + 13124279.

It is an arithmetic number, because the mean of its divisors is an integer number (39372825).

Almost surely, 2^131242745 is an apocalyptic number.

It is an amenable number.

131242745 is a deficient number, since it is larger than the sum of its proper divisors (26248555).

131242745 is an equidigital number, since it uses as much as digits as its factorization.

131242745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26248554.

The product of its digits is 6720, while the sum is 29.

The square root of 131242745 is about 11456.1225988552. The cubic root of 131242745 is about 508.1888144818.

Adding to 131242745 its reverse (547242131), we get a palindrome (678484876).

The spelling of 131242745 in words is "one hundred thirty-one million, two hundred forty-two thousand, seven hundred forty-five".