84563551 has 4 divisors (see below), whose sum is σ = 84606232. Its totient is φ = 84520872.

The previous prime is 84563519. The next prime is 84563561. The reversal of 84563551 is 15536548.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84563551 - 2⁵ = 84563519 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 84563551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84563561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18216 + ... + 22381.

It is an arithmetic number, because the mean of its divisors is an integer number (21151558).

Almost surely, 2^84563551 is an apocalyptic number.

84563551 is a deficient number, since it is larger than the sum of its proper divisors (42681).

84563551 is a wasteful number, since it uses less digits than its factorization.

84563551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42680.

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

The square root of 84563551 is about 9195.8442244309. The cubic root of 84563551 is about 438.9291296496.

The spelling of 84563551 in words is "eighty-four million, five hundred sixty-three thousand, five hundred fifty-one".