84426561 has 12 divisors (see below), whose sum is σ = 122042388. Its totient is φ = 56241504.

The previous prime is 84426493. The next prime is 84426613. The reversal of 84426561 is 16562448.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 56927025 = 5244^2 + 7545^2 .

It is not a de Polignac number, because 84426561 - 2⁹ = 84426049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84426061) 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 11 ways as a sum of consecutive naturals, for example, 12891 + ... + 18303.

It is an arithmetic number, because the mean of its divisors is an integer number (10170199).

Almost surely, 2^84426561 is an apocalyptic number.

It is an amenable number.

84426561 is a deficient number, since it is larger than the sum of its proper divisors (37615827).

84426561 is a wasteful number, since it uses less digits than its factorization.

84426561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152 (or 7149 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 84426561 is about 9188.3927321377. The cubic root of 84426561 is about 438.6919849266.

The spelling of 84426561 in words is "eighty-four million, four hundred twenty-six thousand, five hundred sixty-one".