11621643 has 32 divisors (see below), whose sum is σ = 17694720. Its totient is φ = 6723360.

The previous prime is 11621639. The next prime is 11621657. The reversal of 11621643 is 34612611.

It is not a de Polignac number, because 11621643 - 2² = 11621639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11621633) 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 31 ways as a sum of consecutive naturals, for example, 91446 + ... + 91572.

It is an arithmetic number, because the mean of its divisors is an integer number (552960).

Almost surely, 2^11621643 is an apocalyptic number.

11621643 is a deficient number, since it is larger than the sum of its proper divisors (6073077).

11621643 is a wasteful number, since it uses less digits than its factorization.

11621643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247.

The product of its digits is 864, while the sum is 24.

The square root of 11621643 is about 3409.0530943357. The cubic root of 11621643 is about 226.5109371013.

The spelling of 11621643 in words is "eleven million, six hundred twenty-one thousand, six hundred forty-three".