133691369 has 4 divisors (see below), whose sum is σ = 152790144. Its totient is φ = 114592596.

The previous prime is 133691339. The next prime is 133691381. The reversal of 133691369 is 963196331.

It is a happy number.

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: 963196331 = 839 ⋅1148029.

It is a cyclic number.

It is not a de Polignac number, because 133691369 - 2²⁰ = 132642793 is a prime.

It is a super-2 number, since 2×133691369² = 35746764290188322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133691339) 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, 9549377 + ... + 9549390.

It is an arithmetic number, because the mean of its divisors is an integer number (38197536).

Almost surely, 2^133691369 is an apocalyptic number.

It is an amenable number.

133691369 is a deficient number, since it is larger than the sum of its proper divisors (19098775).

133691369 is an equidigital number, since it uses as much as digits as its factorization.

133691369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19098774.

The product of its digits is 78732, while the sum is 41.

The square root of 133691369 is about 11562.4983891891. The cubic root of 133691369 is about 511.3298230825.

The spelling of 133691369 in words is "one hundred thirty-three million, six hundred ninety-one thousand, three hundred sixty-nine".