55011109 has 2 divisors, whose sum is σ = 55011110. Its totient is φ = 55011108.

The previous prime is 55011091. The next prime is 55011127. The reversal of 55011109 is 90111055.

Together with previous prime (55011091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (55011091) and next prime (55011127).

It can be written as a sum of positive squares in only one way, i.e., 48650625 + 6360484 = 6975^2 + 2522^2 .

It is a cyclic number.

It is not a de Polignac number, because 55011109 - 2⁷ = 55010981 is a prime.

It is a super-2 number, since 2×55011109² = 6052444226819762, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55011109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55011169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27505554 + 27505555.

It is an arithmetic number, because the mean of its divisors is an integer number (27505555).

Almost surely, 2^55011109 is an apocalyptic number.

It is an amenable number.

55011109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55011109 is an equidigital number, since it uses as much as digits as its factorization.

55011109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 55011109 is about 7416.9474179072. The cubic root of 55011109 is about 380.3208485942.

The spelling of 55011109 in words is "fifty-five million, eleven thousand, one hundred nine".