133355689 has 4 divisors (see below), whose sum is σ = 133719424. Its totient is φ = 132991956.

The previous prime is 133355687. The next prime is 133355693. The reversal of 133355689 is 986553331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 986553331 = 31 ⋅31824301.

It is a cyclic number.

It is not a de Polignac number, because 133355689 - 2¹ = 133355687 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (133355683) 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, 181317 + ... + 182050.

It is an arithmetic number, because the mean of its divisors is an integer number (33429856).

Almost surely, 2^133355689 is an apocalyptic number.

It is an amenable number.

133355689 is a deficient number, since it is larger than the sum of its proper divisors (363735).

133355689 is an equidigital number, since it uses as much as digits as its factorization.

133355689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363734.

The product of its digits is 291600, while the sum is 43.

The square root of 133355689 is about 11547.9733719818. The cubic root of 133355689 is about 510.9015055971.

The spelling of 133355689 in words is "one hundred thirty-three million, three hundred fifty-five thousand, six hundred eighty-nine".