11649409 has 4 divisors (see below), whose sum is σ = 11769604. Its totient is φ = 11529216.

The previous prime is 11649401. The next prime is 11649439. The reversal of 11649409 is 90494611.

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 2480625 + 9168784 = 1575^2 + 3028^2 .

It is a cyclic number.

It is not a de Polignac number, because 11649409 - 2³ = 11649401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11649401) 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, 59952 + ... + 60145.

It is an arithmetic number, because the mean of its divisors is an integer number (2942401).

Almost surely, 2^11649409 is an apocalyptic number.

It is an amenable number.

11649409 is a deficient number, since it is larger than the sum of its proper divisors (120195).

11649409 is an equidigital number, since it uses as much as digits as its factorization.

11649409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120194.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 11649409 is about 3413.1230566740. The cubic root of 11649409 is about 226.6911841511.

The spelling of 11649409 in words is "eleven million, six hundred forty-nine thousand, four hundred nine".