55540123 has 2 divisors, whose sum is σ = 55540124. Its totient is φ = 55540122.

The previous prime is 55540109. The next prime is 55540159. The reversal of 55540123 is 32104555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55540123 - 2¹⁷ = 55409051 is a prime.

It is equal to p_3312484 and since 55540123 and 3312484 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55540103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27770061 + 27770062.

It is an arithmetic number, because the mean of its divisors is an integer number (27770062).

Almost surely, 2^55540123 is an apocalyptic number.

55540123 is a deficient number, since it is larger than the sum of its proper divisors (1).

55540123 is an equidigital number, since it uses as much as digits as its factorization.

55540123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55540123 is about 7452.5246057963. The cubic root of 55540123 is about 381.5360791801.

Adding to 55540123 its reverse (32104555), we get a palindrome (87644678).

The spelling of 55540123 in words is "fifty-five million, five hundred forty thousand, one hundred twenty-three".