133645009 has 4 divisors (see below), whose sum is σ = 134871220. Its totient is φ = 132418800.

The previous prime is 133644991. The next prime is 133645049. The reversal of 133645009 is 900546331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900546331 = 167 ⋅5392493.

It can be written as a sum of positive squares in 2 ways, for example, as 56205009 + 77440000 = 7497^2 + 8800^2 .

It is a cyclic number.

It is not a de Polignac number, because 133645009 - 2⁵ = 133644977 is a prime.

It is a super-2 number, since 2×133645009² = 35721976861220162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133645049) 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, 612942 + ... + 613159.

It is an arithmetic number, because the mean of its divisors is an integer number (33717805).

Almost surely, 2^133645009 is an apocalyptic number.

It is an amenable number.

133645009 is a deficient number, since it is larger than the sum of its proper divisors (1226211).

133645009 is a wasteful number, since it uses less digits than its factorization.

133645009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226210.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 133645009 is about 11560.4934583261. The cubic root of 133645009 is about 511.2707118340.

The spelling of 133645009 in words is "one hundred thirty-three million, six hundred forty-five thousand, nine".