86815481 has 4 divisors (see below), whose sum is σ = 91922292. Its totient is φ = 81708672.

The previous prime is 86815471. The next prime is 86815489. The reversal of 86815481 is 18451868.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50623225 + 36192256 = 7115^2 + 6016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86815481 is a prime.

It is a super-2 number, since 2×86815481² = 15073855482522722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86815489) 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, 2553380 + ... + 2553413.

It is an arithmetic number, because the mean of its divisors is an integer number (22980573).

Almost surely, 2^86815481 is an apocalyptic number.

It is an amenable number.

86815481 is a deficient number, since it is larger than the sum of its proper divisors (5106811).

86815481 is a wasteful number, since it uses less digits than its factorization.

86815481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106810.

The product of its digits is 61440, while the sum is 41.

The square root of 86815481 is about 9317.4825462675. The cubic root of 86815481 is about 442.7912789567.

The spelling of 86815481 in words is "eighty-six million, eight hundred fifteen thousand, four hundred eighty-one".