11648551 has 4 divisors (see below), whose sum is σ = 11932704. Its totient is φ = 11364400.

The previous prime is 11648531. The next prime is 11648561. The reversal of 11648551 is 15584611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15584611 = 7 ⋅2226373.

It is a cyclic number.

It is not a de Polignac number, because 11648551 - 2⁷ = 11648423 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 (11648521) 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, 142015 + ... + 142096.

It is an arithmetic number, because the mean of its divisors is an integer number (2983176).

Almost surely, 2^11648551 is an apocalyptic number.

11648551 is a deficient number, since it is larger than the sum of its proper divisors (284153).

11648551 is an equidigital number, since it uses as much as digits as its factorization.

11648551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284152.

The product of its digits is 4800, while the sum is 31.

The square root of 11648551 is about 3412.9973630227. The cubic root of 11648551 is about 226.6856186095.

The spelling of 11648551 in words is "eleven million, six hundred forty-eight thousand, five hundred fifty-one".