55550111 has 2 divisors, whose sum is σ = 55550112. Its totient is φ = 55550110.

The previous prime is 55550081. The next prime is 55550119. The reversal of 55550111 is 11105555.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55550111 - 2²² = 51355807 is a prime.

It is a super-2 number, since 2×55550111² = 6171629664224642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55550119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775055 + 27775056.

It is an arithmetic number, because the mean of its divisors is an integer number (27775056).

Almost surely, 2^55550111 is an apocalyptic number.

55550111 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550111 is an equidigital number, since it uses as much as digits as its factorization.

55550111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 55550111 is about 7453.1946841606. The cubic root of 55550111 is about 381.5589488566.

Adding to 55550111 its reverse (11105555), we get a palindrome (66655666).

The spelling of 55550111 in words is "fifty-five million, five hundred fifty thousand, one hundred eleven".