180131506 has 4 divisors (see below), whose sum is σ = 270197262. Its totient is φ = 90065752.

The previous prime is 180131489. The next prime is 180131513. The reversal of 180131506 is 605131081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 147744025 + 32387481 = 12155^2 + 5691^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45032875 + ... + 45032878.

Almost surely, 2^180131506 is an apocalyptic number.

180131506 is a deficient number, since it is larger than the sum of its proper divisors (90065756).

180131506 is an equidigital number, since it uses as much as digits as its factorization.

180131506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90065755.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 180131506 is about 13421.3079094401. The cubic root of 180131506 is about 564.7590859497.

Adding to 180131506 its reverse (605131081), we get a palindrome (785262587).

The spelling of 180131506 in words is "one hundred eighty million, one hundred thirty-one thousand, five hundred six".