55605121 has 16 divisors (see below), whose sum is σ = 65536128. Its totient is φ = 46512000.

The previous prime is 55605119. The next prime is 55605131. The reversal of 55605121 is 12150655.

It is a cyclic number.

It is not a de Polignac number, because 55605121 - 2¹ = 55605119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55605101) 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, 85620 + ... + 86266.

It is an arithmetic number, because the mean of its divisors is an integer number (4096008).

Almost surely, 2^55605121 is an apocalyptic number.

It is an amenable number.

55605121 is a deficient number, since it is larger than the sum of its proper divisors (9931007).

55605121 is a wasteful number, since it uses less digits than its factorization.

55605121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 55605121 is about 7456.8841348113. The cubic root of 55605121 is about 381.6848569945.

Adding to 55605121 its reverse (12150655), we get a palindrome (67755776).

The spelling of 55605121 in words is "fifty-five million, six hundred five thousand, one hundred twenty-one".