131321745 has 12 divisors (see below), whose sum is σ = 227624436. Its totient is φ = 70038240.

The previous prime is 131321717. The next prime is 131321747. The reversal of 131321745 is 547123131.

It can be written as a sum of positive squares in 2 ways, for example, as 98247744 + 33074001 = 9912^2 + 5751^2 .

It is not a de Polignac number, because 131321745 - 2⁶ = 131321681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131321747) 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 11 ways as a sum of consecutive naturals, for example, 1459086 + ... + 1459175.

It is an arithmetic number, because the mean of its divisors is an integer number (18968703).

Almost surely, 2^131321745 is an apocalyptic number.

131321745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131321745 is a deficient number, since it is larger than the sum of its proper divisors (96302691).

131321745 is a wasteful number, since it uses less digits than its factorization.

131321745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918272 (or 2918269 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 131321745 is about 11459.5700181115. The cubic root of 131321745 is about 508.2907600883.

Adding to 131321745 its reverse (547123131), we get a palindrome (678444876).

The spelling of 131321745 in words is "one hundred thirty-one million, three hundred twenty-one thousand, seven hundred forty-five".