53317809 has 12 divisors (see below), whose sum is σ = 77078196. Its totient is φ = 35515872.

The previous prime is 53317757. The next prime is 53317829. The reversal of 53317809 is 90871335.

It can be written as a sum of positive squares in 2 ways, for example, as 28037025 + 25280784 = 5295^2 + 5028^2 .

It is not a de Polignac number, because 53317809 - 2⁷ = 53317681 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53317829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18579 + ... + 21255.

It is an arithmetic number, because the mean of its divisors is an integer number (6423183).

Almost surely, 2^53317809 is an apocalyptic number.

It is an amenable number.

53317809 is a deficient number, since it is larger than the sum of its proper divisors (23760387).

53317809 is a wasteful number, since it uses less digits than its factorization.

53317809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896 (or 4893 counting only the distinct ones).

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

The square root of 53317809 is about 7301.9044776003. The cubic root of 53317809 is about 376.3778856157.

The spelling of 53317809 in words is "fifty-three million, three hundred seventeen thousand, eight hundred nine".