131445005 has 4 divisors (see below), whose sum is σ = 157734012. Its totient is φ = 105156000.

The previous prime is 131444987. The next prime is 131445011. The reversal of 131445005 is 500544131.

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 74321641 + 57123364 = 8621^2 + 7558^2 .

It is not a de Polignac number, because 131445005 - 2¹⁸ = 131182861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13144496 + ... + 13144505.

It is an arithmetic number, because the mean of its divisors is an integer number (39433503).

Almost surely, 2^131445005 is an apocalyptic number.

It is an amenable number.

131445005 is a deficient number, since it is larger than the sum of its proper divisors (26289007).

131445005 is an equidigital number, since it uses as much as digits as its factorization.

131445005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26289006.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 131445005 is about 11464.9467944688. The cubic root of 131445005 is about 508.4497394139.

Adding to 131445005 its reverse (500544131), we get a palindrome (631989136).

The spelling of 131445005 in words is "one hundred thirty-one million, four hundred forty-five thousand, five".