84787231 has 4 divisors (see below), whose sum is σ = 85610512. Its totient is φ = 83963952.

The previous prime is 84787229. The next prime is 84787247. The reversal of 84787231 is 13278748.

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

It is not a de Polignac number, because 84787231 - 2¹ = 84787229 is a prime.

It is a super-2 number, since 2×84787231² = 14377749081294722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84787331) 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, 411486 + ... + 411691.

It is an arithmetic number, because the mean of its divisors is an integer number (21402628).

Almost surely, 2^84787231 is an apocalyptic number.

84787231 is a deficient number, since it is larger than the sum of its proper divisors (823281).

84787231 is a wasteful number, since it uses less digits than its factorization.

84787231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823280.

The product of its digits is 75264, while the sum is 40.

The square root of 84787231 is about 9207.9982080798. The cubic root of 84787231 is about 439.3157943854.

The spelling of 84787231 in words is "eighty-four million, seven hundred eighty-seven thousand, two hundred thirty-one".