133555540 has 12 divisors (see below), whose sum is σ = 280466676. Its totient is φ = 53422208.

The previous prime is 133555531. The next prime is 133555561. The reversal of 133555540 is 45555331.

It can be written as a sum of positive squares in 2 ways, for example, as 39891856 + 93663684 = 6316^2 + 9678^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3338869 + ... + 3338908.

It is an arithmetic number, because the mean of its divisors is an integer number (23372223).

Almost surely, 2^133555540 is an apocalyptic number.

133555540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133555540 is an abundant number, since it is smaller than the sum of its proper divisors (146911136).

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

133555540 is a wasteful number, since it uses less digits than its factorization.

133555540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6677786 (or 6677784 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 31.

The square root of 133555540 is about 11556.6232092251. The cubic root of 133555540 is about 511.1565958611.

It can be divided in two parts, 13 and 3555540, that added together give a palindrome (3555553).

The spelling of 133555540 in words is "one hundred thirty-three million, five hundred fifty-five thousand, five hundred forty".