11648581 has 4 divisors (see below), whose sum is σ = 13312672. Its totient is φ = 9984492.

The previous prime is 11648561. The next prime is 11648597. The reversal of 11648581 is 18584611.

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.

It is not a de Polignac number, because 11648581 - 2⁷ = 11648453 is a prime.

It is a super-2 number, since 2×11648581² = 271378878627122, 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 (11648521) 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, 832035 + ... + 832048.

It is an arithmetic number, because the mean of its divisors is an integer number (3328168).

Almost surely, 2^11648581 is an apocalyptic number.

It is an amenable number.

11648581 is a deficient number, since it is larger than the sum of its proper divisors (1664091).

11648581 is an equidigital number, since it uses as much as digits as its factorization.

11648581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664090.

The product of its digits is 7680, while the sum is 34.

The square root of 11648581 is about 3413.0017579837. The cubic root of 11648581 is about 226.6858132135.

The spelling of 11648581 in words is "eleven million, six hundred forty-eight thousand, five hundred eighty-one".