54020809 has 2 divisors, whose sum is σ = 54020810. Its totient is φ = 54020808.

The previous prime is 54020801. The next prime is 54020831. The reversal of 54020809 is 90802045.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 5760000 = 6947^2 + 2400^2 .

It is a cyclic number.

It is not a de Polignac number, because 54020809 - 2³ = 54020801 is a prime.

It is not a weakly prime, because it can be changed into another prime (54020801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27010404 + 27010405.

It is an arithmetic number, because the mean of its divisors is an integer number (27010405).

Almost surely, 2^54020809 is an apocalyptic number.

It is an amenable number.

54020809 is a deficient number, since it is larger than the sum of its proper divisors (1).

54020809 is an equidigital number, since it uses as much as digits as its factorization.

54020809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 54020809 is about 7349.8849650862. The cubic root of 54020809 is about 378.0248600243.

The spelling of 54020809 in words is "fifty-four million, twenty thousand, eight hundred nine".