44991221 has 16 divisors (see below), whose sum is σ = 52526400. Its totient is φ = 38102400.

The previous prime is 44991203. The next prime is 44991239. The reversal of 44991221 is 12219944.

It is an interprime number because it is at equal distance from previous prime (44991203) and next prime (44991239).

It is a cyclic number.

It is not a de Polignac number, because 44991221 - 2¹⁴ = 44974837 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 (44991251) 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, 10985 + ... + 14513.

It is an arithmetic number, because the mean of its divisors is an integer number (3282900).

Almost surely, 2^44991221 is an apocalyptic number.

It is an amenable number.

44991221 is a deficient number, since it is larger than the sum of its proper divisors (7535179).

44991221 is a wasteful number, since it uses less digits than its factorization.

44991221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620.

The product of its digits is 5184, while the sum is 32.

The square root of 44991221 is about 6707.5495525564. The cubic root of 44991221 is about 355.6661985993. Note that the first 3 decimals are identical.

The spelling of 44991221 in words is "forty-four million, nine hundred ninety-one thousand, two hundred twenty-one".