131205404 has 48 divisors (see below), whose sum is σ = 260620416.
Its totient is φ = 57268800.
The previous prime is 131205391. The next prime is 131205419. The reversal of 131205404 is 404502131.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134639 + ... + 135609.
It is an arithmetic number, because the mean of its divisors is an integer number (5429592).
Almost surely, 2131205404 is an apocalyptic number.
It is an amenable number.
131205404 is a deficient number, since it is larger than the sum of its proper divisors (129415012).
131205404 is a wasteful number, since it uses less digits than its factorization.
131205404 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1106 (or 1104 counting only the distinct ones).
The product of its (nonzero) digits is 480, while the sum is 20.
The square root of 131205404 is about 11454.4927430245.
The cubic root of 131205404 is about 508.1406135228.
Adding to 131205404 its reverse (404502131), we get a palindrome (535707535).
The spelling of 131205404 in words is "one hundred thirty-one million, two hundred five thousand, four hundred four".