11397509 has 4 divisors (see below), whose sum is σ = 11416716. Its totient is φ = 11378304.

The previous prime is 11397499. The next prime is 11397527. The reversal of 11397509 is 90579311.

11397509 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2265025 + 9132484 = 1505^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 11397509 - 2¹⁶ = 11331973 is a prime.

It is a super-2 number, since 2×11397509² = 259806422810162, 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 (11397539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8684 + ... + 9909.

It is an arithmetic number, because the mean of its divisors is an integer number (2854179).

Almost surely, 2^11397509 is an apocalyptic number.

It is an amenable number.

11397509 is a deficient number, since it is larger than the sum of its proper divisors (19207).

11397509 is an equidigital number, since it uses as much as digits as its factorization.

11397509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19206.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 11397509 is about 3376.0196978098. The cubic root of 11397509 is about 225.0453176209.

The spelling of 11397509 in words is "eleven million, three hundred ninety-seven thousand, five hundred nine".