133011661 has 8 divisors (see below), whose sum is σ = 137733120. Its totient is φ = 128299248.

The previous prime is 133011653. The next prime is 133011701. The reversal of 133011661 is 166110331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133011661 - 2³ = 133011653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133011611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43980 + ... + 46906.

It is an arithmetic number, because the mean of its divisors is an integer number (17216640).

Almost surely, 2^133011661 is an apocalyptic number.

It is an amenable number.

133011661 is a deficient number, since it is larger than the sum of its proper divisors (4721459).

133011661 is a wasteful number, since it uses less digits than its factorization.

133011661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 133011661 is about 11533.0681520574. The cubic root of 133011661 is about 510.4617898619.

Adding to 133011661 its reverse (166110331), we get a palindrome (299121992).

The spelling of 133011661 in words is "one hundred thirty-three million, eleven thousand, six hundred sixty-one".