133555977 has 12 divisors (see below), whose sum is σ = 198128580. Its totient is φ = 86630688.

The previous prime is 133555973. The next prime is 133555987. The reversal of 133555977 is 779555331.

133555977 is a `hidden beast` number, since 1 + 3 + 3 + 55 + 597 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 85821696 + 47734281 = 9264^2 + 6909^2 .

It is not a de Polignac number, because 133555977 - 2² = 133555973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133555973) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 200202 + ... + 200867.

It is an arithmetic number, because the mean of its divisors is an integer number (16510715).

Almost surely, 2^133555977 is an apocalyptic number.

It is an amenable number.

133555977 is a deficient number, since it is larger than the sum of its proper divisors (64572603).

133555977 is a wasteful number, since it uses less digits than its factorization.

133555977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401112 (or 401109 counting only the distinct ones).

The product of its digits is 496125, while the sum is 45.

The square root of 133555977 is about 11556.6421161166. The cubic root of 133555977 is about 511.1571533699.

The spelling of 133555977 in words is "one hundred thirty-three million, five hundred fifty-five thousand, nine hundred seventy-seven".