84579121 has 6 divisors (see below), whose sum is σ = 92967266. Its totient is φ = 76890000.

The previous prime is 84579107. The next prime is 84579163. The reversal of 84579121 is 12197548.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 10962721 = 8580^2 + 3311^2 .

It is not a de Polignac number, because 84579121 - 2¹³ = 84570929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84579101) 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 5 ways as a sum of consecutive naturals, for example, 349380 + ... + 349621.

Almost surely, 2^84579121 is an apocalyptic number.

It is an amenable number.

84579121 is a deficient number, since it is larger than the sum of its proper divisors (8388145).

84579121 is a wasteful number, since it uses less digits than its factorization.

84579121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699023 (or 699012 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 84579121 is about 9196.6907635301. The cubic root of 84579121 is about 438.9560668153.

It can be divided in two parts, 8457 and 9121, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 84579121 in words is "eighty-four million, five hundred seventy-nine thousand, one hundred twenty-one".