133553905 has 24 divisors (see below), whose sum is σ = 168413112. Its totient is φ = 101597184.

The previous prime is 133553899. The next prime is 133553923. The reversal of 133553905 is 509355331.

It can be written as a sum of positive squares in 12 ways, for example, as 13454224 + 120099681 = 3668^2 + 10959^2 .

It is not a de Polignac number, because 133553905 - 2⁵ = 133553873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519537 + ... + 519793.

It is an arithmetic number, because the mean of its divisors is an integer number (7017213).

Almost surely, 2^133553905 is an apocalyptic number.

It is an amenable number.

133553905 is a deficient number, since it is larger than the sum of its proper divisors (34859207).

133553905 is an equidigital number, since it uses as much as digits as its factorization.

133553905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 30375, while the sum is 34.

The square root of 133553905 is about 11556.5524703520. The cubic root of 133553905 is about 511.1545099762.

The spelling of 133553905 in words is "one hundred thirty-three million, five hundred fifty-three thousand, nine hundred five".