133607561 has 6 divisors (see below), whose sum is σ = 136947486. Its totient is φ = 130347200.

The previous prime is 133607543. The next prime is 133607597. The reversal of 133607561 is 165706331.

It can be written as a sum of positive squares in 3 ways, for example, as 4080400 + 129527161 = 2020^2 + 11381^2 .

It is not a de Polignac number, because 133607561 - 2⁶ = 133607497 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133607501) 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, 38060 + ... + 41421.

It is an arithmetic number, because the mean of its divisors is an integer number (22824581).

Almost surely, 2^133607561 is an apocalyptic number.

It is an amenable number.

133607561 is a deficient number, since it is larger than the sum of its proper divisors (3339925).

133607561 is an frugal number, since it uses more digits than its factorization.

133607561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79563 (or 79522 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 133607561 is about 11558.8736908057. The cubic root of 133607561 is about 511.2229538361. Note that the first 3 decimals are identical.

The spelling of 133607561 in words is "one hundred thirty-three million, six hundred seven thousand, five hundred sixty-one".