84809523 has 4 divisors (see below), whose sum is σ = 113079368. Its totient is φ = 56539680.

The previous prime is 84809509. The next prime is 84809537. The reversal of 84809523 is 32590848.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (84809509) and next prime (84809537).

It is not a de Polignac number, because 84809523 - 2¹⁴ = 84793139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84809503) 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, 14134918 + ... + 14134923.

It is an arithmetic number, because the mean of its divisors is an integer number (28269842).

Almost surely, 2^84809523 is an apocalyptic number.

84809523 is a deficient number, since it is larger than the sum of its proper divisors (28269845).

84809523 is a wasteful number, since it uses less digits than its factorization.

84809523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28269844.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 84809523 is about 9209.2085979198. The cubic root of 84809523 is about 439.3542922010.

The spelling of 84809523 in words is "eighty-four million, eight hundred nine thousand, five hundred twenty-three".