11473509 has 4 divisors (see below), whose sum is σ = 15298016. Its totient is φ = 7649004.

The previous prime is 11473489. The next prime is 11473537. The reversal of 11473509 is 90537411.

11473509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 11473509 - 2⁷ = 11473381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11473109) 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, 1912249 + ... + 1912254.

It is an arithmetic number, because the mean of its divisors is an integer number (3824504).

Almost surely, 2^11473509 is an apocalyptic number.

It is an amenable number.

11473509 is a deficient number, since it is larger than the sum of its proper divisors (3824507).

11473509 is an equidigital number, since it uses as much as digits as its factorization.

11473509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824506.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 11473509 is about 3387.2568547425. The cubic root of 11473509 is about 225.5444199068.

It can be divided in two parts, 1147 and 3509, that added together give a triangular number (4656 = T₉₆).

The spelling of 11473509 in words is "eleven million, four hundred seventy-three thousand, five hundred nine".