86915421 has 6 divisors (see below), whose sum is σ = 125544510. Its totient is φ = 57943608.

The previous prime is 86915399. The next prime is 86915471. The reversal of 86915421 is 12451968.

It can be written as a sum of positive squares in only one way, i.e., 75012921 + 11902500 = 8661^2 + 3450^2 .

It is not a de Polignac number, because 86915421 - 2⁷ = 86915293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86915471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4828626 + ... + 4828643.

It is an arithmetic number, because the mean of its divisors is an integer number (20924085).

Almost surely, 2^86915421 is an apocalyptic number.

It is an amenable number.

86915421 is a deficient number, since it is larger than the sum of its proper divisors (38629089).

86915421 is a wasteful number, since it uses less digits than its factorization.

86915421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657275 (or 9657272 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 86915421 is about 9322.8440403130. The cubic root of 86915421 is about 442.9611242036.

It can be divided in two parts, 869 and 15421, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 86915421 in words is "eighty-six million, nine hundred fifteen thousand, four hundred twenty-one".