84155147 has 4 divisors (see below), whose sum is σ = 84429576. Its totient is φ = 83880720.

The previous prime is 84155143. The next prime is 84155209. The reversal of 84155147 is 74155148.

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 84155147 - 2² = 84155143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84155143) 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, 136754 + ... + 137367.

It is an arithmetic number, because the mean of its divisors is an integer number (21107394).

Almost surely, 2^84155147 is an apocalyptic number.

84155147 is a deficient number, since it is larger than the sum of its proper divisors (274429).

84155147 is a wasteful number, since it uses less digits than its factorization.

84155147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274428.

The product of its digits is 22400, while the sum is 35.

The square root of 84155147 is about 9173.6114480612. The cubic root of 84155147 is about 438.2213788145.

Subtracting from 84155147 its reverse (74155148), we obtain a palindrome (9999999).

The spelling of 84155147 in words is "eighty-four million, one hundred fifty-five thousand, one hundred forty-seven".