133531412 has 24 divisors (see below), whose sum is σ = 268093056. Its totient is φ = 57007008.

The previous prime is 133531397. The next prime is 133531423. The reversal of 133531412 is 214135331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703 + ... + 16430.

It is an arithmetic number, because the mean of its divisors is an integer number (11170544).

Almost surely, 2^133531412 is an apocalyptic number.

It is an amenable number.

133531412 is an abundant number, since it is smaller than the sum of its proper divisors (134561644).

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

133531412 is a wasteful number, since it uses less digits than its factorization.

133531412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18407 (or 18405 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 133531412 is about 11555.5792585227. The cubic root of 133531412 is about 511.1258123406.

Adding to 133531412 its reverse (214135331), we get a palindrome (347666743).

The spelling of 133531412 in words is "one hundred thirty-three million, five hundred thirty-one thousand, four hundred twelve".