131212404 has 36 divisors (see below), whose sum is σ = 349134240. Its totient is φ = 41435280.

The previous prime is 131212387. The next prime is 131212427. The reversal of 131212404 is 404212131.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95232 + ... + 96599.

Almost surely, 2^131212404 is an apocalyptic number.

It is an amenable number.

131212404 is an abundant number, since it is smaller than the sum of its proper divisors (217921836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131212404 is a wasteful number, since it uses less digits than its factorization.

131212404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191860 (or 191855 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 131212404 is about 11454.7982959108. The cubic root of 131212404 is about 508.1496500435.

Adding to 131212404 its reverse (404212131), we get a palindrome (535424535).

The spelling of 131212404 in words is "one hundred thirty-one million, two hundred twelve thousand, four hundred four".