86047768921 has 3 divisors (see below), whose sum is σ = 86048062261. Its totient is φ = 86047475582.

The previous prime is 86047768907. The next prime is 86047768931. The reversal of 86047768921 is 12986774068.

The square root of 86047768921 is 293339.

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 86047768921 - 2¹⁵ = 86047736153 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86047768931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 146670 + ... + 440008.

Almost surely, 2^86047768921 is an apocalyptic number.

86047768921 is the 293339-th square number.

86047768921 is the 146670-th centered octagonal number.

It is an amenable number.

86047768921 is a deficient number, since it is larger than the sum of its proper divisors (293340).

86047768921 is an frugal number, since it uses more digits than its factorization.

86047768921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586678 (or 293339 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 86047768921 in words is "eighty-six billion, forty-seven million, seven hundred sixty-eight thousand, nine hundred twenty-one".