55420111 has 2 divisors, whose sum is σ = 55420112. Its totient is φ = 55420110.

The previous prime is 55420109. The next prime is 55420121. The reversal of 55420111 is 11102455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55420111 - 2¹ = 55420109 is a prime.

Together with 55420109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55420121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710055 + 27710056.

It is an arithmetic number, because the mean of its divisors is an integer number (27710056).

Almost surely, 2^55420111 is an apocalyptic number.

55420111 is a deficient number, since it is larger than the sum of its proper divisors (1).

55420111 is an equidigital number, since it uses as much as digits as its factorization.

55420111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 55420111 is about 7444.4684833774. The cubic root of 55420111 is about 381.2610712184.

Adding to 55420111 its reverse (11102455), we get a palindrome (66522566).

The spelling of 55420111 in words is "fifty-five million, four hundred twenty thousand, one hundred eleven".