133531656 has 16 divisors (see below), whose sum is σ = 333829200. Its totient is φ = 44510544.

The previous prime is 133531637. The next prime is 133531661. The reversal of 133531656 is 656135331.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2781886 + ... + 2781933.

It is an arithmetic number, because the mean of its divisors is an integer number (20864325).

Almost surely, 2^133531656 is an apocalyptic number.

It is an amenable number.

133531656 is an abundant number, since it is smaller than the sum of its proper divisors (200297544).

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

133531656 is a wasteful number, since it uses less digits than its factorization.

133531656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563828 (or 5563824 counting only the distinct ones).

The product of its digits is 24300, while the sum is 33.

The square root of 133531656 is about 11555.5898161885. The cubic root of 133531656 is about 511.1261236646.

Adding to 133531656 its reverse (656135331), we get a palindrome (789666987).

The spelling of 133531656 in words is "one hundred thirty-three million, five hundred thirty-one thousand, six hundred fifty-six".