53509909 has 4 divisors (see below), whose sum is σ = 56326240. Its totient is φ = 50693580.

The previous prime is 53509889. The next prime is 53509921. The reversal of 53509909 is 90990535.

It is a happy number.

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 53509909 - 2⁵ = 53509877 is a prime.

It is a super-2 number, since 2×53509909² = 5726620722376562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53509969) 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, 1408137 + ... + 1408174.

It is an arithmetic number, because the mean of its divisors is an integer number (14081560).

Almost surely, 2^53509909 is an apocalyptic number.

It is an amenable number.

53509909 is a deficient number, since it is larger than the sum of its proper divisors (2816331).

53509909 is a wasteful number, since it uses less digits than its factorization.

53509909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816330.

The product of its (nonzero) digits is 54675, while the sum is 40.

The square root of 53509909 is about 7315.0467530973. The cubic root of 53509909 is about 376.8293641084.

The spelling of 53509909 in words is "fifty-three million, five hundred nine thousand, nine hundred nine".