133563861 has 6 divisors (see below), whose sum is σ = 192925590. Its totient is φ = 89042568.

The previous prime is 133563839. The next prime is 133563889. The reversal of 133563861 is 168365331.

It is a happy number.

133563861 is a `hidden beast` number, since 1 + 33 + 563 + 8 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 130302225 + 3261636 = 11415^2 + 1806^2 .

It is not a de Polignac number, because 133563861 - 2⁶ = 133563797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133563811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7420206 + ... + 7420223.

It is an arithmetic number, because the mean of its divisors is an integer number (32154265).

Almost surely, 2^133563861 is an apocalyptic number.

It is an amenable number.

133563861 is a deficient number, since it is larger than the sum of its proper divisors (59361729).

133563861 is a wasteful number, since it uses less digits than its factorization.

133563861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14840435 (or 14840432 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 133563861 is about 11556.9832136246. The cubic root of 133563861 is about 511.1672112842.

The spelling of 133563861 in words is "one hundred thirty-three million, five hundred sixty-three thousand, eight hundred sixty-one".