133225561 has 6 divisors (see below), whose sum is σ = 154976730. Its totient is φ = 114193296.

The previous prime is 133225553. The next prime is 133225597. The reversal of 133225561 is 165522331.

It can be written as a sum of positive squares in only one way, i.e., 126697536 + 6528025 = 11256^2 + 2555^2 .

It is not a de Polignac number, because 133225561 - 2³ = 133225553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133225501) 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, 1359396 + ... + 1359493.

It is an arithmetic number, because the mean of its divisors is an integer number (25829455).

Almost surely, 2^133225561 is an apocalyptic number.

It is an amenable number.

133225561 is a deficient number, since it is larger than the sum of its proper divisors (21751169).

133225561 is an equidigital number, since it uses as much as digits as its factorization.

133225561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718903 (or 2718896 counting only the distinct ones).

The product of its digits is 5400, while the sum is 28.

The square root of 133225561 is about 11542.3377614762. The cubic root of 133225561 is about 510.7352729006.

Adding to 133225561 its reverse (165522331), we get a palindrome (298747892).

The spelling of 133225561 in words is "one hundred thirty-three million, two hundred twenty-five thousand, five hundred sixty-one".