86905521 has 16 divisors (see below), whose sum is σ = 129467520. Its totient is φ = 57613680.

The previous prime is 86905519. The next prime is 86905571. The reversal of 86905521 is 12550968.

It is a happy number.

It is not a de Polignac number, because 86905521 - 2¹ = 86905519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86905571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4005 + ... + 13778.

It is an arithmetic number, because the mean of its divisors is an integer number (8091720).

Almost surely, 2^86905521 is an apocalyptic number.

It is an amenable number.

86905521 is a deficient number, since it is larger than the sum of its proper divisors (42561999).

86905521 is a wasteful number, since it uses less digits than its factorization.

86905521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17973 (or 17967 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 86905521 is about 9322.3130713359. The cubic root of 86905521 is about 442.9443052410.

The spelling of 86905521 in words is "eighty-six million, nine hundred five thousand, five hundred twenty-one".