133444789 has 4 divisors (see below), whose sum is σ = 133536256. Its totient is φ = 133353324.

The previous prime is 133444777. The next prime is 133444793. The reversal of 133444789 is 987444331.

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 a cyclic number.

It is not a de Polignac number, because 133444789 - 2⁵ = 133444757 is a prime.

It is a super-2 number, since 2×133444789² = 35615023422509042, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133444889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43509 + ... + 46474.

It is an arithmetic number, because the mean of its divisors is an integer number (33384064).

Almost surely, 2^133444789 is an apocalyptic number.

It is an amenable number.

133444789 is a deficient number, since it is larger than the sum of its proper divisors (91467).

133444789 is an equidigital number, since it uses as much as digits as its factorization.

133444789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91466.

The product of its digits is 290304, while the sum is 43.

The square root of 133444789 is about 11551.8305475799. The cubic root of 133444789 is about 511.0152644978.

The spelling of 133444789 in words is "one hundred thirty-three million, four hundred forty-four thousand, seven hundred eighty-nine".