131008645 has 4 divisors (see below), whose sum is σ = 157210380. Its totient is φ = 104806912.

The previous prime is 131008643. The next prime is 131008679. The reversal of 131008645 is 546800131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546800131 = 20879 ⋅26189.

It can be written as a sum of positive squares in 2 ways, for example, as 33907329 + 97101316 = 5823^2 + 9854^2 .

It is a cyclic number.

It is not a de Polignac number, because 131008645 - 2¹ = 131008643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131008643) 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, 13100860 + ... + 13100869.

It is an arithmetic number, because the mean of its divisors is an integer number (39302595).

Almost surely, 2^131008645 is an apocalyptic number.

It is an amenable number.

131008645 is a deficient number, since it is larger than the sum of its proper divisors (26201735).

131008645 is an equidigital number, since it uses as much as digits as its factorization.

131008645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26201734.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 131008645 is about 11445.9007946076. The cubic root of 131008645 is about 507.8864795320.

Adding to 131008645 its reverse (546800131), we get a palindrome (677808776).

It can be divided in two parts, 1310086 and 45, that added together give a palindrome (1310131).

The spelling of 131008645 in words is "one hundred thirty-one million, eight thousand, six hundred forty-five".