55609123 has 2 divisors, whose sum is σ = 55609124. Its totient is φ = 55609122.

The previous prime is 55609111. The next prime is 55609139. The reversal of 55609123 is 32190655.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55609123 is a prime.

It is not a weakly prime, because it can be changed into another prime (55609823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27804561 + 27804562.

It is an arithmetic number, because the mean of its divisors is an integer number (27804562).

Almost surely, 2^55609123 is an apocalyptic number.

55609123 is a deficient number, since it is larger than the sum of its proper divisors (1).

55609123 is an equidigital number, since it uses as much as digits as its factorization.

55609123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 55609123 is about 7457.1524726265. The cubic root of 55609123 is about 381.6940136220.

Adding to 55609123 its reverse (32190655), we get a palindrome (87799778).

The spelling of 55609123 in words is "fifty-five million, six hundred nine thousand, one hundred twenty-three".