44521643 has 16 divisors (see below), whose sum is σ = 47246976. Its totient is φ = 41907840.

The previous prime is 44521639. The next prime is 44521649. The reversal of 44521643 is 34612544.

It is a cyclic number.

It is not a de Polignac number, because 44521643 - 2² = 44521639 is a prime.

It is a super-3 number, since 3×44521643³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44521649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151805 + ... + 152097.

It is an arithmetic number, because the mean of its divisors is an integer number (2952936).

Almost surely, 2^44521643 is an apocalyptic number.

44521643 is a deficient number, since it is larger than the sum of its proper divisors (2725333).

44521643 is a wasteful number, since it uses less digits than its factorization.

44521643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454.

The product of its digits is 11520, while the sum is 29.

The square root of 44521643 is about 6672.4540463011. The cubic root of 44521643 is about 354.4244936973.

Subtracting from 44521643 its reverse (34612544), we obtain a palindrome (9909099).

The spelling of 44521643 in words is "forty-four million, five hundred twenty-one thousand, six hundred forty-three".