133929721 has 2 divisors, whose sum is σ = 133929722. Its totient is φ = 133929720.

The previous prime is 133929673. The next prime is 133929749. The reversal of 133929721 is 127929331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85766121 + 48163600 = 9261^2 + 6940^2 .

It is a cyclic number.

It is not a de Polignac number, because 133929721 - 2¹⁵ = 133896953 is a prime.

It is not a weakly prime, because it can be changed into another prime (133923721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66964860 + 66964861.

It is an arithmetic number, because the mean of its divisors is an integer number (66964861).

Almost surely, 2^133929721 is an apocalyptic number.

It is an amenable number.

133929721 is a deficient number, since it is larger than the sum of its proper divisors (1).

133929721 is an equidigital number, since it uses as much as digits as its factorization.

133929721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 37.

The square root of 133929721 is about 11572.8009142126. The cubic root of 133929721 is about 511.6335179016.

The spelling of 133929721 in words is "one hundred thirty-three million, nine hundred twenty-nine thousand, seven hundred twenty-one".