133431808 has 20 divisors (see below), whose sum is σ = 266604030. Its totient is φ = 66715648.

The previous prime is 133431797. The next prime is 133431811. The reversal of 133431808 is 808134331.

It can be written as a sum of positive squares in only one way, i.e., 93083904 + 40347904 = 9648^2 + 6352^2 .

It is a super-2 number, since 2×133431808² = 35608094772297728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133431808.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129793 + ... + 130816.

Almost surely, 2^133431808 is an apocalyptic number.

It is an amenable number.

133431808 is a deficient number, since it is larger than the sum of its proper divisors (133172222).

133431808 is an frugal number, since it uses more digits than its factorization.

133431808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260627 (or 260611 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 133431808 is about 11551.2686749119. The cubic root of 133431808 is about 510.9986940887.

It can be divided in two parts, 13343 and 1808, that added together give a palindrome (15151).

The spelling of 133431808 in words is "one hundred thirty-three million, four hundred thirty-one thousand, eight hundred eight".