55609111 has 2 divisors, whose sum is σ = 55609112. Its totient is φ = 55609110.

The previous prime is 55609097. The next prime is 55609123. The reversal of 55609111 is 11190655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55609111 - 2⁹ = 55608599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55609111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55609171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27804555 + 27804556.

It is an arithmetic number, because the mean of its divisors is an integer number (27804556).

Almost surely, 2^55609111 is an apocalyptic number.

55609111 is a deficient number, since it is larger than the sum of its proper divisors (1).

55609111 is an equidigital number, since it uses as much as digits as its factorization.

55609111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 55609111 is about 7457.1516680298. The cubic root of 55609111 is about 381.6939861665.

Adding to 55609111 its reverse (11190655), we get a palindrome (66799766).

The spelling of 55609111 in words is "fifty-five million, six hundred nine thousand, one hundred eleven".