133656261 has 16 divisors (see below), whose sum is σ = 189692928. Its totient is φ = 83417600.

The previous prime is 133656253. The next prime is 133656277. The reversal of 133656261 is 162656331.

It is a cyclic number.

It is not a de Polignac number, because 133656261 - 2³ = 133656253 is a prime.

It is a super-2 number, since 2×133656261² = 35727992209000242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133656361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2881 + ... + 16601.

It is an arithmetic number, because the mean of its divisors is an integer number (11855808).

Almost surely, 2^133656261 is an apocalyptic number.

It is an amenable number.

133656261 is a deficient number, since it is larger than the sum of its proper divisors (56036667).

133656261 is a wasteful number, since it uses less digits than its factorization.

133656261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13932.

The product of its digits is 19440, while the sum is 33.

The square root of 133656261 is about 11560.9801055101. The cubic root of 133656261 is about 511.2850599359.

The spelling of 133656261 in words is "one hundred thirty-three million, six hundred fifty-six thousand, two hundred sixty-one".