5551109 has 2 divisors, whose sum is σ = 5551110. Its totient is φ = 5551108.

The previous prime is 5551099. The next prime is 5551111. The reversal of 5551109 is 9011555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4389025 + 1162084 = 2095^2 + 1078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5551109 is a prime.

It is a super-2 number, since 2×5551109² = 61629622259762, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 5551111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5551159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2775554 + 2775555.

It is an arithmetic number, because the mean of its divisors is an integer number (2775555).

Almost surely, 2^5551109 is an apocalyptic number.

It is an amenable number.

5551109 is a deficient number, since it is larger than the sum of its proper divisors (1).

5551109 is an equidigital number, since it uses as much as digits as its factorization.

5551109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 5551109 is about 2356.0791582627. The cubic root of 5551109 is about 177.0624972147.

It can be divided in two parts, 555 and 1109, that multiplied together give a triangular number (615495 = T₁₁₀₉).

The spelling of 5551109 in words is "five million, five hundred fifty-one thousand, one hundred nine".