133561645 has 16 divisors (see below), whose sum is σ = 184953600. Its totient is φ = 90693504.

The previous prime is 133561633. The next prime is 133561661. The reversal of 133561645 is 546165331.

It is a cyclic number.

It is not a de Polignac number, because 133561645 - 2⁹ = 133561133 is a prime.

It is a super-3 number, since 3×133561645³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133561645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14920 + ... + 22129.

It is an arithmetic number, because the mean of its divisors is an integer number (11559600).

Almost surely, 2^133561645 is an apocalyptic number.

It is an amenable number.

133561645 is a deficient number, since it is larger than the sum of its proper divisors (51391955).

133561645 is a wasteful number, since it uses less digits than its factorization.

133561645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37164.

The product of its digits is 32400, while the sum is 34.

The square root of 133561645 is about 11556.8873404563. The cubic root of 133561645 is about 511.1643842900.

The spelling of 133561645 in words is "one hundred thirty-three million, five hundred sixty-one thousand, six hundred forty-five".