53173809 has 24 divisors (see below), whose sum is σ = 84127680. Its totient is φ = 32163552.

The previous prime is 53173801. The next prime is 53173819. The reversal of 53173809 is 90837135.

It is not a de Polignac number, because 53173809 - 2³ = 53173801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53173801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3052 + ... + 10754.

It is an arithmetic number, because the mean of its divisors is an integer number (3505320).

Almost surely, 2^53173809 is an apocalyptic number.

53173809 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

53173809 is a deficient number, since it is larger than the sum of its proper divisors (30953871).

53173809 is a wasteful number, since it uses less digits than its factorization.

53173809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781 (or 7778 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 53173809 is about 7292.0373696245. The cubic root of 53173809 is about 376.0387413869.

The spelling of 53173809 in words is "fifty-three million, one hundred seventy-three thousand, eight hundred nine".