84447121 has 4 divisors (see below), whose sum is σ = 92124144. Its totient is φ = 76770100.

The previous prime is 84447107. The next prime is 84447137. The reversal of 84447121 is 12174448.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 84447121 - 2⁷ = 84446993 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84442121) 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 3 ways as a sum of consecutive naturals, for example, 3838495 + ... + 3838516.

It is an arithmetic number, because the mean of its divisors is an integer number (23031036).

Almost surely, 2^84447121 is an apocalyptic number.

It is an amenable number.

84447121 is a deficient number, since it is larger than the sum of its proper divisors (7677023).

84447121 is a wasteful number, since it uses less digits than its factorization.

84447121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7677022.

The product of its digits is 7168, while the sum is 31.

The square root of 84447121 is about 9189.5114668844. The cubic root of 84447121 is about 438.7275928958.

The spelling of 84447121 in words is "eighty-four million, four hundred forty-seven thousand, one hundred twenty-one".