133261236 has 18 divisors (see below), whose sum is σ = 336854882. Its totient is φ = 44420400.

The previous prime is 133261223. The next prime is 133261237. The reversal of 133261236 is 632162331.

It is a happy number.

133261236 is a `hidden beast` number, since 13 + 3 + 2 + 612 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 92044836 + 41216400 = 9594^2 + 6420^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133261237) 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 5 ways as a sum of consecutive naturals, for example, 1850815 + ... + 1850886.

Almost surely, 2^133261236 is an apocalyptic number.

It is an amenable number.

133261236 is an abundant number, since it is smaller than the sum of its proper divisors (203593646).

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

133261236 is a wasteful number, since it uses less digits than its factorization.

133261236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701711 (or 3701706 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 133261236 is about 11543.8830555407. The cubic root of 133261236 is about 510.7808568827.

The spelling of 133261236 in words is "one hundred thirty-three million, two hundred sixty-one thousand, two hundred thirty-six".