131121404 has 12 divisors (see below), whose sum is σ = 231270144. Its totient is φ = 65044224.

The previous prime is 131121379. The next prime is 131121409. The reversal of 131121404 is 404121131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128549 + ... + 129564.

It is an arithmetic number, because the mean of its divisors is an integer number (19272512).

Almost surely, 2^131121404 is an apocalyptic number.

It is an amenable number.

131121404 is a deficient number, since it is larger than the sum of its proper divisors (100148740).

131121404 is a wasteful number, since it uses less digits than its factorization.

131121404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258244 (or 258242 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 131121404 is about 11450.8254724277. The cubic root of 131121404 is about 508.0321501962.

Adding to 131121404 its reverse (404121131), we get a palindrome (535242535).

The spelling of 131121404 in words is "one hundred thirty-one million, one hundred twenty-one thousand, four hundred four".