55819811 has 2 divisors, whose sum is σ = 55819812. Its totient is φ = 55819810.

The previous prime is 55819783. The next prime is 55819831. The reversal of 55819811 is 11891855.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55819811 - 2¹⁰ = 55818787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55819831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27909905 + 27909906.

It is an arithmetic number, because the mean of its divisors is an integer number (27909906).

Almost surely, 2^55819811 is an apocalyptic number.

55819811 is a deficient number, since it is larger than the sum of its proper divisors (1).

55819811 is an equidigital number, since it uses as much as digits as its factorization.

55819811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 38.

The square root of 55819811 is about 7471.2656892925. The cubic root of 55819811 is about 382.1754514155.

The spelling of 55819811 in words is "fifty-five million, eight hundred nineteen thousand, eight hundred eleven".