84553561 has 4 divisors (see below), whose sum is σ = 85162000. Its totient is φ = 83945124.

The previous prime is 84553537. The next prime is 84553643. The reversal of 84553561 is 16535548.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84553561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84553561.

It is not an unprimeable number, because it can be changed into a prime (84553501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304011 + ... + 304288.

It is an arithmetic number, because the mean of its divisors is an integer number (21290500).

Almost surely, 2^84553561 is an apocalyptic number.

It is an amenable number.

84553561 is a deficient number, since it is larger than the sum of its proper divisors (608439).

84553561 is a wasteful number, since it uses less digits than its factorization.

84553561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608438.

The product of its digits is 72000, while the sum is 37.

The square root of 84553561 is about 9195.3010282426. The cubic root of 84553561 is about 438.9118445244.

The spelling of 84553561 in words is "eighty-four million, five hundred fifty-three thousand, five hundred sixty-one".