133205649 has 4 divisors (see below), whose sum is σ = 177607536. Its totient is φ = 88803764.

The previous prime is 133205641. The next prime is 133205731. The reversal of 133205649 is 946502331.

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: 946502331 = 3 ⋅315500777.

It is a cyclic number.

It is not a de Polignac number, because 133205649 - 2³ = 133205641 is a prime.

It is a super-2 number, since 2×133205649² = 35487489851022402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133205641) 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, 22200939 + ... + 22200944.

It is an arithmetic number, because the mean of its divisors is an integer number (44401884).

Almost surely, 2^133205649 is an apocalyptic number.

It is an amenable number.

133205649 is a deficient number, since it is larger than the sum of its proper divisors (44401887).

133205649 is an equidigital number, since it uses as much as digits as its factorization.

133205649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44401886.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 133205649 is about 11541.4751656796. The cubic root of 133205649 is about 510.7098266640.

The spelling of 133205649 in words is "one hundred thirty-three million, two hundred five thousand, six hundred forty-nine".