135051209 has 4 divisors (see below), whose sum is σ = 136678416. Its totient is φ = 133424004.

The previous prime is 135051197. The next prime is 135051223. The reversal of 135051209 is 902150531.

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: 902150531 = 29 ⋅31108639.

It is a cyclic number.

It is not a de Polignac number, because 135051209 - 2¹⁶ = 134985673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135051299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813479 + ... + 813644.

It is an arithmetic number, because the mean of its divisors is an integer number (34169604).

Almost surely, 2^135051209 is an apocalyptic number.

It is an amenable number.

135051209 is a deficient number, since it is larger than the sum of its proper divisors (1627207).

135051209 is an equidigital number, since it uses as much as digits as its factorization.

135051209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627206.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 135051209 is about 11621.1535141741. The cubic root of 135051209 is about 513.0576396242.

The spelling of 135051209 in words is "one hundred thirty-five million, fifty-one thousand, two hundred nine".