135521811 has 12 divisors (see below), whose sum is σ = 195858000. Its totient is φ = 90299760.

The previous prime is 135521797. The next prime is 135521831. The reversal of 135521811 is 118125531.

135521811 is a `hidden beast` number, since 135 + 521 + 8 + 1 + 1 = 666.

It is not a de Polignac number, because 135521811 - 2²¹ = 133424659 is a prime.

It is a super-2 number, since 2×135521811² = 36732322513439442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135521831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24481 + ... + 29501.

It is an arithmetic number, because the mean of its divisors is an integer number (16321500).

Almost surely, 2^135521811 is an apocalyptic number.

135521811 is a deficient number, since it is larger than the sum of its proper divisors (60336189).

135521811 is a wasteful number, since it uses less digits than its factorization.

135521811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8026 (or 8023 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 135521811 is about 11641.3835517949. The cubic root of 135521811 is about 513.6528855454.

The spelling of 135521811 in words is "one hundred thirty-five million, five hundred twenty-one thousand, eight hundred eleven".