53918809 has 4 divisors (see below), whose sum is σ = 61621504. Its totient is φ = 46216116.

The previous prime is 53918797. The next prime is 53918833. The reversal of 53918809 is 90881935.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53918809 - 2⁷ = 53918681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53918869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3851337 + ... + 3851350.

It is an arithmetic number, because the mean of its divisors is an integer number (15405376).

Almost surely, 2^53918809 is an apocalyptic number.

It is an amenable number.

53918809 is a deficient number, since it is larger than the sum of its proper divisors (7702695).

53918809 is an equidigital number, since it uses as much as digits as its factorization.

53918809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7702694.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 53918809 is about 7342.9428024464. The cubic root of 53918809 is about 377.7867861526.

The spelling of 53918809 in words is "fifty-three million, nine hundred eighteen thousand, eight hundred nine".