181404131 has 4 divisors (see below), whose sum is σ = 185828664. Its totient is φ = 176979600.

The previous prime is 181404109. The next prime is 181404163. The reversal of 181404131 is 131404181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131404181 = 1483 ⋅88607.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181404131 is a prime.

It is a super-3 number, since 3×181404131³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181404097 and 181404106.

It is not an unprimeable number, because it can be changed into a prime (181404731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212205 + ... + 2212286.

It is an arithmetic number, because the mean of its divisors is an integer number (46457166).

Almost surely, 2^181404131 is an apocalyptic number.

181404131 is a deficient number, since it is larger than the sum of its proper divisors (4424533).

181404131 is an equidigital number, since it uses as much as digits as its factorization.

181404131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424532.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 181404131 is about 13468.6350830364. The cubic root of 181404131 is about 566.0859694110.

The spelling of 181404131 in words is "one hundred eighty-one million, four hundred four thousand, one hundred thirty-one".