84219281 has 4 divisors (see below), whose sum is σ = 86936064. Its totient is φ = 81502500.

The previous prime is 84219271. The next prime is 84219287. The reversal of 84219281 is 18291248.

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 not a de Polignac number, because 84219281 - 2²² = 80024977 is a prime.

It is a super-2 number, since 2×84219281² = 14185774584313922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (84219287) 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, 1358345 + ... + 1358406.

It is an arithmetic number, because the mean of its divisors is an integer number (21734016).

Almost surely, 2^84219281 is an apocalyptic number.

It is an amenable number.

84219281 is a deficient number, since it is larger than the sum of its proper divisors (2716783).

84219281 is a wasteful number, since it uses less digits than its factorization.

84219281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716782.

The product of its digits is 9216, while the sum is 35.

The square root of 84219281 is about 9177.1063522224. The cubic root of 84219281 is about 438.3326722783.

The spelling of 84219281 in words is "eighty-four million, two hundred nineteen thousand, two hundred eighty-one".