86521445 has 4 divisors (see below), whose sum is σ = 103825740. Its totient is φ = 69217152.

The previous prime is 86521427. The next prime is 86521447. The reversal of 86521445 is 54412568.

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 45778756 + 40742689 = 6766^2 + 6383^2 .

It is a cyclic number.

It is not a de Polignac number, because 86521445 - 2⁸ = 86521189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86521447) 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, 8652140 + ... + 8652149.

It is an arithmetic number, because the mean of its divisors is an integer number (25956435).

Almost surely, 2^86521445 is an apocalyptic number.

It is an amenable number.

86521445 is a deficient number, since it is larger than the sum of its proper divisors (17304295).

86521445 is a wasteful number, since it uses less digits than its factorization.

86521445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17304294.

The product of its digits is 38400, while the sum is 35.

The square root of 86521445 is about 9301.6904377645. The cubic root of 86521445 is about 442.2908158284.

The spelling of 86521445 in words is "eighty-six million, five hundred twenty-one thousand, four hundred forty-five".