11641655 has 4 divisors (see below), whose sum is σ = 13969992. Its totient is φ = 9313320.

The previous prime is 11641639. The next prime is 11641681. The reversal of 11641655 is 55614611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55614611 = 13 ⋅4278047.

It is not a de Polignac number, because 11641655 - 2⁴ = 11641639 is a prime.

It is a super-3 number, since 3×11641655³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1164161 + ... + 1164170.

It is an arithmetic number, because the mean of its divisors is an integer number (3492498).

Almost surely, 2^11641655 is an apocalyptic number.

11641655 is a deficient number, since it is larger than the sum of its proper divisors (2328337).

11641655 is an equidigital number, since it uses as much as digits as its factorization.

11641655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328336.

The product of its digits is 3600, while the sum is 29.

The square root of 11641655 is about 3411.9869577711. The cubic root of 11641655 is about 226.6408767755.

The spelling of 11641655 in words is "eleven million, six hundred forty-one thousand, six hundred fifty-five".