86723521 has 2 divisors, whose sum is σ = 86723522. Its totient is φ = 86723520.

The previous prime is 86723479. The next prime is 86723557. The reversal of 86723521 is 12532768.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 2359296 = 9185^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 86723521 - 2¹¹ = 86721473 is a prime.

It is not a weakly prime, because it can be changed into another prime (86723591) 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 as a sum of consecutive naturals, namely, 43361760 + 43361761.

It is an arithmetic number, because the mean of its divisors is an integer number (43361761).

Almost surely, 2^86723521 is an apocalyptic number.

It is an amenable number.

86723521 is a deficient number, since it is larger than the sum of its proper divisors (1).

86723521 is an equidigital number, since it uses as much as digits as its factorization.

86723521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 86723521 is about 9312.5464294145. The cubic root of 86723521 is about 442.6348803077.

The spelling of 86723521 in words is "eighty-six million, seven hundred twenty-three thousand, five hundred twenty-one".