55140205 has 4 divisors (see below), whose sum is σ = 66168252. Its totient is φ = 44112160.

The previous prime is 55140191. The next prime is 55140221. The reversal of 55140205 is 50204155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50204155 = 5 ⋅10040831.

It can be written as a sum of positive squares in 2 ways, for example, as 28079401 + 27060804 = 5299^2 + 5202^2 .

It is not a de Polignac number, because 55140205 - 2¹⁷ = 55009133 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5514016 + ... + 5514025.

It is an arithmetic number, because the mean of its divisors is an integer number (16542063).

Almost surely, 2^55140205 is an apocalyptic number.

It is an amenable number.

55140205 is a deficient number, since it is larger than the sum of its proper divisors (11028047).

55140205 is a wasteful number, since it uses less digits than its factorization.

55140205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11028046.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55140205 is about 7425.6450898222. The cubic root of 55140205 is about 380.6181191196.

The spelling of 55140205 in words is "fifty-five million, one hundred forty thousand, two hundred five".