84131855 has 4 divisors (see below), whose sum is σ = 100958232. Its totient is φ = 67305480.

The previous prime is 84131851. The next prime is 84131857. The reversal of 84131855 is 55813148.

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

It is not a de Polignac number, because 84131855 - 2² = 84131851 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84131851) 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, 8413181 + ... + 8413190.

It is an arithmetic number, because the mean of its divisors is an integer number (25239558).

Almost surely, 2^84131855 is an apocalyptic number.

84131855 is a deficient number, since it is larger than the sum of its proper divisors (16826377).

84131855 is a wasteful number, since it uses less digits than its factorization.

84131855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16826376.

The product of its digits is 19200, while the sum is 35.

The square root of 84131855 is about 9172.3418492771. The cubic root of 84131855 is about 438.1809455808.

The spelling of 84131855 in words is "eighty-four million, one hundred thirty-one thousand, eight hundred fifty-five".