53975209 has 4 divisors (see below), whose sum is σ = 54065620. Its totient is φ = 53884800.

The previous prime is 53975197. The next prime is 53975213. The reversal of 53975209 is 90257935.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47997184 + 5978025 = 6928^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 53975209 - 2⁷ = 53975081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53975239) 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, 44304 + ... + 45505.

It is an arithmetic number, because the mean of its divisors is an integer number (13516405).

Almost surely, 2^53975209 is an apocalyptic number.

It is an amenable number.

53975209 is a deficient number, since it is larger than the sum of its proper divisors (90411).

53975209 is an equidigital number, since it uses as much as digits as its factorization.

53975209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90410.

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 53975209 is about 7346.7822208093. The cubic root of 53975209 is about 377.9184640725.

The spelling of 53975209 in words is "fifty-three million, nine hundred seventy-five thousand, two hundred nine".