54105809 has 2 divisors, whose sum is σ = 54105810. Its totient is φ = 54105808.

The previous prime is 54105769. The next prime is 54105817. The reversal of 54105809 is 90850145.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 3411409 = 7120^2 + 1847^2 .

It is a cyclic number.

It is not a de Polignac number, because 54105809 - 2⁸ = 54105553 is a prime.

It is not a weakly prime, because it can be changed into another prime (54105839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27052904 + 27052905.

It is an arithmetic number, because the mean of its divisors is an integer number (27052905).

Almost surely, 2^54105809 is an apocalyptic number.

It is an amenable number.

54105809 is a deficient number, since it is larger than the sum of its proper divisors (1).

54105809 is an equidigital number, since it uses as much as digits as its factorization.

54105809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 54105809 is about 7355.6650956933. The cubic root of 54105809 is about 378.2230260981.

The spelling of 54105809 in words is "fifty-four million, one hundred five thousand, eight hundred nine".