133721966 has 64 divisors (see below), whose sum is σ = 251942400. Its totient is φ = 51938304.

The previous prime is 133721947. The next prime is 133721971. The reversal of 133721966 is 669127331.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1249685 + ... + 1249791.

It is an arithmetic number, because the mean of its divisors is an integer number (3936600).

Almost surely, 2^133721966 is an apocalyptic number.

133721966 is a deficient number, since it is larger than the sum of its proper divisors (118220434).

133721966 is a wasteful number, since it uses less digits than its factorization.

133721966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its digits is 40824, while the sum is 38.

The square root of 133721966 is about 11563.8214271927. The cubic root of 133721966 is about 511.3688282562.

The spelling of 133721966 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, nine hundred sixty-six".