133539973 has 4 divisors (see below), whose sum is σ = 152617120. Its totient is φ = 114462828.

The previous prime is 133539953. The next prime is 133540003. The reversal of 133539973 is 379935331.

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: 379935331 = 269 ⋅1412399.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133539973 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 (133539943) 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, 9538563 + ... + 9538576.

It is an arithmetic number, because the mean of its divisors is an integer number (38154280).

Almost surely, 2^133539973 is an apocalyptic number.

It is an amenable number.

133539973 is a deficient number, since it is larger than the sum of its proper divisors (19077147).

133539973 is an equidigital number, since it uses as much as digits as its factorization.

133539973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19077146.

The product of its digits is 229635, while the sum is 43.

The square root of 133539973 is about 11555.9496797104. The cubic root of 133539973 is about 511.1367352500.

The spelling of 133539973 in words is "one hundred thirty-three million, five hundred thirty-nine thousand, nine hundred seventy-three".