84572109 has 6 divisors (see below), whose sum is σ = 122159726. Its totient is φ = 56381400.

The previous prime is 84572087. The next prime is 84572141. The reversal of 84572109 is 90127548.

84572109 is a `hidden beast` number, since 84 + 572 + 1 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 70509609 + 14062500 = 8397^2 + 3750^2 .

It is not a de Polignac number, because 84572109 - 2⁵ = 84572077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84572009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4698442 + ... + 4698459.

Almost surely, 2^84572109 is an apocalyptic number.

It is an amenable number.

84572109 is a deficient number, since it is larger than the sum of its proper divisors (37587617).

84572109 is a wasteful number, since it uses less digits than its factorization.

84572109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9396907 (or 9396904 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 84572109 is about 9196.3095315458. The cubic root of 84572109 is about 438.9439359845.

It can be divided in two parts, 84572 and 109, that added together give a square (84681 = 291²).

The spelling of 84572109 in words is "eighty-four million, five hundred seventy-two thousand, one hundred nine".