133989555 has 32 divisors (see below), whose sum is σ = 246412800. Its totient is φ = 60901632.

The previous prime is 133989553. The next prime is 133989587. The reversal of 133989555 is 555989331.

It is a happy number.

It is not a de Polignac number, because 133989555 - 2¹ = 133989553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133989553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15231 + ... + 22359.

It is an arithmetic number, because the mean of its divisors is an integer number (7700400).

Almost surely, 2^133989555 is an apocalyptic number.

133989555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

133989555 is a deficient number, since it is larger than the sum of its proper divisors (112423245).

133989555 is a wasteful number, since it uses less digits than its factorization.

133989555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7323.

The product of its digits is 729000, while the sum is 48.

The square root of 133989555 is about 11575.3857387130. The cubic root of 133989555 is about 511.7096984585.

The spelling of 133989555 in words is "one hundred thirty-three million, nine hundred eighty-nine thousand, five hundred fifty-five".