133542109 has 2 divisors, whose sum is σ = 133542110. Its totient is φ = 133542108.

The previous prime is 133542107. The next prime is 133542121. The reversal of 133542109 is 901245331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130462084 + 3080025 = 11422^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 133542109 - 2¹ = 133542107 is a prime.

Together with 133542107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133542107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66771054 + 66771055.

It is an arithmetic number, because the mean of its divisors is an integer number (66771055).

Almost surely, 2^133542109 is an apocalyptic number.

It is an amenable number.

133542109 is a deficient number, since it is larger than the sum of its proper divisors (1).

133542109 is an equidigital number, since it uses as much as digits as its factorization.

133542109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 133542109 is about 11556.0420992656. The cubic root of 133542109 is about 511.1394604821.

The spelling of 133542109 in words is "one hundred thirty-three million, five hundred forty-two thousand, one hundred nine".