133999569 has 16 divisors (see below), whose sum is σ = 216565440. Its totient is φ = 81211680.

The previous prime is 133999513. The next prime is 133999573. The reversal of 133999569 is 965999331.

It is a happy number.

It is not a de Polignac number, because 133999569 - 2²⁴ = 117222353 is a prime.

It is a super-2 number, since 2×133999569² = 35911768984371522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133999069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225292 + ... + 225885.

It is an arithmetic number, because the mean of its divisors is an integer number (13535340).

Almost surely, 2^133999569 is an apocalyptic number.

It is an amenable number.

133999569 is a deficient number, since it is larger than the sum of its proper divisors (82565871).

133999569 is a wasteful number, since it uses less digits than its factorization.

133999569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451197 (or 451191 counting only the distinct ones).

The product of its digits is 1771470, while the sum is 54.

The square root of 133999569 is about 11575.8182864107. The cubic root of 133999569 is about 511.7224460523.

The spelling of 133999569 in words is "one hundred thirty-three million, nine hundred ninety-nine thousand, five hundred sixty-nine".