55135811 has 8 divisors (see below), whose sum is σ = 58773600. Its totient is φ = 51541888.

The previous prime is 55135793. The next prime is 55135819. The reversal of 55135811 is 11853155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55135811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55135819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8351 + ... + 13416.

It is an arithmetic number, because the mean of its divisors is an integer number (7346700).

Almost surely, 2^55135811 is an apocalyptic number.

55135811 is a deficient number, since it is larger than the sum of its proper divisors (3637789).

55135811 is a wasteful number, since it uses less digits than its factorization.

55135811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21933.

The product of its digits is 3000, while the sum is 29.

The square root of 55135811 is about 7425.3492173769. The cubic root of 55135811 is about 380.6080086479.

Adding to 55135811 its reverse (11853155), we get a palindrome (66988966).

The spelling of 55135811 in words is "fifty-five million, one hundred thirty-five thousand, eight hundred eleven".