131233145 has 8 divisors (see below), whose sum is σ = 158350920. Its totient is φ = 104405760.

The previous prime is 131233139. The next prime is 131233153. The reversal of 131233145 is 541332131.

It can be written as a sum of positive squares in 4 ways, for example, as 9174841 + 122058304 = 3029^2 + 11048^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131233145 - 2²⁰ = 130184569 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131233145.

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 7 ways as a sum of consecutive naturals, for example, 71600 + ... + 73409.

It is an arithmetic number, because the mean of its divisors is an integer number (19793865).

Almost surely, 2^131233145 is an apocalyptic number.

It is an amenable number.

131233145 is a deficient number, since it is larger than the sum of its proper divisors (27117775).

131233145 is a wasteful number, since it uses less digits than its factorization.

131233145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145195.

The product of its digits is 1080, while the sum is 23.

The square root of 131233145 is about 11455.7036012634. The cubic root of 131233145 is about 508.1764233675.

Adding to 131233145 its reverse (541332131), we get a palindrome (672565276).

The spelling of 131233145 in words is "one hundred thirty-one million, two hundred thirty-three thousand, one hundred forty-five".