55135687 has 4 divisors (see below), whose sum is σ = 55500976. Its totient is φ = 54770400.

The previous prime is 55135681. The next prime is 55135697. The reversal of 55135687 is 78653155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55135687 - 2²³ = 46747079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55135681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182418 + ... + 182719.

It is an arithmetic number, because the mean of its divisors is an integer number (13875244).

Almost surely, 2^55135687 is an apocalyptic number.

55135687 is a deficient number, since it is larger than the sum of its proper divisors (365289).

55135687 is a wasteful number, since it uses less digits than its factorization.

55135687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365288.

The product of its digits is 126000, while the sum is 40.

The square root of 55135687 is about 7425.3408675966. The cubic root of 55135687 is about 380.6077233196.

The spelling of 55135687 in words is "fifty-five million, one hundred thirty-five thousand, six hundred eighty-seven".