86155521 has 4 divisors (see below), whose sum is σ = 114874032. Its totient is φ = 57437012.

The previous prime is 86155513. The next prime is 86155543. The reversal of 86155521 is 12555168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86155521 - 2³ = 86155513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86155591) 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, 14359251 + ... + 14359256.

It is an arithmetic number, because the mean of its divisors is an integer number (28718508).

Almost surely, 2^86155521 is an apocalyptic number.

It is an amenable number.

86155521 is a deficient number, since it is larger than the sum of its proper divisors (28718511).

86155521 is a wasteful number, since it uses less digits than its factorization.

86155521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28718510.

The product of its digits is 12000, while the sum is 33.

The square root of 86155521 is about 9281.9998383969. Note that the first 3 decimals coincide. The cubic root of 86155521 is about 441.6664098412. Note that the first 3 decimals are identical.

The spelling of 86155521 in words is "eighty-six million, one hundred fifty-five thousand, five hundred twenty-one".