86804561 has 4 divisors (see below), whose sum is σ = 87168000. Its totient is φ = 86441124.

The previous prime is 86804539. The next prime is 86804563. The reversal of 86804561 is 16540868.

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 86804561 - 2¹⁰ = 86803537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86804563) 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, 181361 + ... + 181838.

It is an arithmetic number, because the mean of its divisors is an integer number (21792000).

Almost surely, 2^86804561 is an apocalyptic number.

It is an amenable number.

86804561 is a deficient number, since it is larger than the sum of its proper divisors (363439).

86804561 is a wasteful number, since it uses less digits than its factorization.

86804561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363438.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 86804561 is about 9316.8965326443. The cubic root of 86804561 is about 442.7727128229.

The spelling of 86804561 in words is "eighty-six million, eight hundred four thousand, five hundred sixty-one".