55109591 has 2 divisors, whose sum is σ = 55109592. Its totient is φ = 55109590.

The previous prime is 55109573. The next prime is 55109623. The reversal of 55109591 is 19590155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55109591 - 2¹⁸ = 54847447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55109891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27554795 + 27554796.

It is an arithmetic number, because the mean of its divisors is an integer number (27554796).

Almost surely, 2^55109591 is an apocalyptic number.

55109591 is a deficient number, since it is larger than the sum of its proper divisors (1).

55109591 is an equidigital number, since it uses as much as digits as its factorization.

55109591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10125, while the sum is 35.

The square root of 55109591 is about 7423.5834338950. The cubic root of 55109591 is about 380.5476659889.

The spelling of 55109591 in words is "fifty-five million, one hundred nine thousand, five hundred ninety-one".