11649621 has 4 divisors (see below), whose sum is σ = 15532832. Its totient is φ = 7766412.

The previous prime is 11649613. The next prime is 11649623. The reversal of 11649621 is 12694611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12694611 = 3 ⋅4231537.

It is not a de Polignac number, because 11649621 - 2³ = 11649613 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 (11649623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1941601 + ... + 1941606.

It is an arithmetic number, because the mean of its divisors is an integer number (3883208).

Almost surely, 2^11649621 is an apocalyptic number.

It is an amenable number.

11649621 is a deficient number, since it is larger than the sum of its proper divisors (3883211).

11649621 is an equidigital number, since it uses as much as digits as its factorization.

11649621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3883210.

The product of its digits is 2592, while the sum is 30.

The square root of 11649621 is about 3413.1541131335. The cubic root of 11649621 is about 226.6925592778.

The spelling of 11649621 in words is "eleven million, six hundred forty-nine thousand, six hundred twenty-one".