86481921 has 4 divisors (see below), whose sum is σ = 115309232. Its totient is φ = 57654612.

The previous prime is 86481919. The next prime is 86481943. The reversal of 86481921 is 12918468.

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 not a de Polignac number, because 86481921 - 2¹ = 86481919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86481921.

It is not an unprimeable number, because it can be changed into a prime (86481961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14413651 + ... + 14413656.

It is an arithmetic number, because the mean of its divisors is an integer number (28827308).

Almost surely, 2^86481921 is an apocalyptic number.

It is an amenable number.

86481921 is a deficient number, since it is larger than the sum of its proper divisors (28827311).

86481921 is a wasteful number, since it uses less digits than its factorization.

86481921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28827310.

The product of its digits is 27648, while the sum is 39.

The square root of 86481921 is about 9299.5656350176. The cubic root of 86481921 is about 442.2234577118.

The spelling of 86481921 in words is "eighty-six million, four hundred eighty-one thousand, nine hundred twenty-one".