135128611 has 16 divisors (see below), whose sum is σ = 143700480. Its totient is φ = 126808000.

The previous prime is 135128593. The next prime is 135128629. The reversal of 135128611 is 116821531.

It is an interprime number because it is at equal distance from previous prime (135128593) and next prime (135128629).

It is a cyclic number.

It is not a de Polignac number, because 135128611 - 2¹⁷ = 134997539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135128611.

It is not an unprimeable number, because it can be changed into a prime (135128671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513666 + ... + 513928.

It is an arithmetic number, because the mean of its divisors is an integer number (8981280).

Almost surely, 2^135128611 is an apocalyptic number.

135128611 is a deficient number, since it is larger than the sum of its proper divisors (8571869).

135128611 is a wasteful number, since it uses less digits than its factorization.

135128611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626.

The product of its digits is 1440, while the sum is 28.

The square root of 135128611 is about 11624.4832573323. The cubic root of 135128611 is about 513.1556372738.

The spelling of 135128611 in words is "one hundred thirty-five million, one hundred twenty-eight thousand, six hundred eleven".