55205123 has 2 divisors, whose sum is σ = 55205124. Its totient is φ = 55205122.

The previous prime is 55205099. The next prime is 55205131. The reversal of 55205123 is 32150255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55205123 - 2¹⁰ = 55204099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (55205153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27602561 + 27602562.

It is an arithmetic number, because the mean of its divisors is an integer number (27602562).

Almost surely, 2^55205123 is an apocalyptic number.

55205123 is a deficient number, since it is larger than the sum of its proper divisors (1).

55205123 is an equidigital number, since it uses as much as digits as its factorization.

55205123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55205123 is about 7430.0150067143. The cubic root of 55205123 is about 380.7674310815.

Adding to 55205123 its reverse (32150255), we get a palindrome (87355378).

It can be divided in two parts, 5520 and 5123, that multiplied together give a triangular number (28278960 = T₇₅₂₀).

The spelling of 55205123 in words is "fifty-five million, two hundred five thousand, one hundred twenty-three".