54090809 has 2 divisors, whose sum is σ = 54090810. Its totient is φ = 54090808.

The previous prime is 54090797. The next prime is 54090811. The reversal of 54090809 is 90809045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42510400 + 11580409 = 6520^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 54090809 - 2¹⁶ = 54025273 is a prime.

Together with 54090811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (54090109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27045404 + 27045405.

It is an arithmetic number, because the mean of its divisors is an integer number (27045405).

Almost surely, 2^54090809 is an apocalyptic number.

It is an amenable number.

54090809 is a deficient number, since it is larger than the sum of its proper divisors (1).

54090809 is an equidigital number, since it uses as much as digits as its factorization.

54090809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 54090809 is about 7354.6454027370. The cubic root of 54090809 is about 378.1880707033.

The spelling of 54090809 in words is "fifty-four million, ninety thousand, eight hundred nine".