86523421 has 6 divisors (see below), whose sum is σ = 91912730. Its totient is φ = 81433536.

The previous prime is 86523413. The next prime is 86523431. The reversal of 86523421 is 12432568.

It can be written as a sum of positive squares in 3 ways, for example, as 56700900 + 29822521 = 7530^2 + 5461^2 .

It is not a de Polignac number, because 86523421 - 2³ = 86523413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86523431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149406 + ... + 149983.

Almost surely, 2^86523421 is an apocalyptic number.

It is an amenable number.

86523421 is a deficient number, since it is larger than the sum of its proper divisors (5389309).

86523421 is a wasteful number, since it uses less digits than its factorization.

86523421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299423 (or 299406 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 86523421 is about 9301.7966544104. The cubic root of 86523421 is about 442.2941828549.

Adding to 86523421 its reverse (12432568), we get a palindrome (98955989).

The spelling of 86523421 in words is "eighty-six million, five hundred twenty-three thousand, four hundred twenty-one".