86993321 has 4 divisors (see below), whose sum is σ = 87062100. Its totient is φ = 86924544.

The previous prime is 86993303. The next prime is 86993323. The reversal of 86993321 is 12339968.

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 28302400 + 58690921 = 5320^2 + 7661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86993321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86993323) 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, 32456 + ... + 35033.

It is an arithmetic number, because the mean of its divisors is an integer number (21765525).

Almost surely, 2^86993321 is an apocalyptic number.

It is an amenable number.

86993321 is a deficient number, since it is larger than the sum of its proper divisors (68779).

86993321 is a wasteful number, since it uses less digits than its factorization.

86993321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68778.

The product of its digits is 69984, while the sum is 41.

The square root of 86993321 is about 9327.0210142360. The cubic root of 86993321 is about 443.0934228113.

The spelling of 86993321 in words is "eighty-six million, nine hundred ninety-three thousand, three hundred twenty-one".