65003509 has 4 divisors (see below), whose sum is σ = 65100204. Its totient is φ = 64906816.

The previous prime is 65003473. The next prime is 65003551. The reversal of 65003509 is 90530056.

It is a happy number.

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 37859409 + 27144100 = 6153^2 + 5210^2 .

It is a cyclic number.

It is not a de Polignac number, because 65003509 - 2⁹ = 65002997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65006509) 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, 47332 + ... + 48685.

It is an arithmetic number, because the mean of its divisors is an integer number (16275051).

Almost surely, 2^65003509 is an apocalyptic number.

It is an amenable number.

65003509 is a deficient number, since it is larger than the sum of its proper divisors (96695).

65003509 is an equidigital number, since it uses as much as digits as its factorization.

65003509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96694.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 65003509 is about 8062.4753643034. The cubic root of 65003509 is about 402.0798109732.

The spelling of 65003509 in words is "sixty-five million, three thousand, five hundred nine".