53919809 has 2 divisors, whose sum is σ = 53919810. Its totient is φ = 53919808.

The previous prime is 53919799. The next prime is 53919821. The reversal of 53919809 is 90891935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32092225 + 21827584 = 5665^2 + 4672^2 .

It is a cyclic number.

It is not a de Polignac number, because 53919809 - 2⁸ = 53919553 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53919809.

It is not a weakly prime, because it can be changed into another prime (53919829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26959904 + 26959905.

It is an arithmetic number, because the mean of its divisors is an integer number (26959905).

Almost surely, 2^53919809 is an apocalyptic number.

It is an amenable number.

53919809 is a deficient number, since it is larger than the sum of its proper divisors (1).

53919809 is an equidigital number, since it uses as much as digits as its factorization.

53919809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 53919809 is about 7343.0108947216. The cubic root of 53919809 is about 377.7891216669.

The spelling of 53919809 in words is "fifty-three million, nine hundred nineteen thousand, eight hundred nine".