86694721 has 3 divisors (see below), whose sum is σ = 86704033. Its totient is φ = 86685410.

The previous prime is 86694719. The next prime is 86694733. The reversal of 86694721 is 12749668.

The square root of 86694721 is 9311.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 86694721 - 2¹ = 86694719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86694121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4656 + ... + 13966.

Almost surely, 2^86694721 is an apocalyptic number.

86694721 is the 9311-st square number.

86694721 is the 4656-th centered octagonal number.

It is an amenable number.

86694721 is a deficient number, since it is larger than the sum of its proper divisors (9312).

86694721 is an frugal number, since it uses more digits than its factorization.

86694721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18622 (or 9311 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The cubic root of 86694721 is about 442.5858767009.

The spelling of 86694721 in words is "eighty-six million, six hundred ninety-four thousand, seven hundred twenty-one".