86506621 has 2 divisors, whose sum is σ = 86506622. Its totient is φ = 86506620.

The previous prime is 86506619. The next prime is 86506633. The reversal of 86506621 is 12660568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84842521 + 1664100 = 9211^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 86506621 - 2¹ = 86506619 is a prime.

Together with 86506619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86500621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43253310 + 43253311.

It is an arithmetic number, because the mean of its divisors is an integer number (43253311).

Almost surely, 2^86506621 is an apocalyptic number.

It is an amenable number.

86506621 is a deficient number, since it is larger than the sum of its proper divisors (1).

86506621 is an equidigital number, since it uses as much as digits as its factorization.

86506621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 86506621 is about 9300.8935592232. The cubic root of 86506621 is about 442.2655546786.

The spelling of 86506621 in words is "eighty-six million, five hundred six thousand, six hundred twenty-one".