133389561 has 4 divisors (see below), whose sum is σ = 177852752. Its totient is φ = 88926372.

The previous prime is 133389541. The next prime is 133389577. The reversal of 133389561 is 165983331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 133389561 - 2⁷ = 133389433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133389511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22231591 + ... + 22231596.

It is an arithmetic number, because the mean of its divisors is an integer number (44463188).

Almost surely, 2^133389561 is an apocalyptic number.

It is an amenable number.

133389561 is a deficient number, since it is larger than the sum of its proper divisors (44463191).

133389561 is an equidigital number, since it uses as much as digits as its factorization.

133389561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44463190.

The product of its digits is 58320, while the sum is 39.

The square root of 133389561 is about 11549.4398565472. The cubic root of 133389561 is about 510.9447578223.

The spelling of 133389561 in words is "one hundred thirty-three million, three hundred eighty-nine thousand, five hundred sixty-one".