86911621 has 2 divisors, whose sum is σ = 86911622. Its totient is φ = 86911620.

The previous prime is 86911619. The next prime is 86911639. The reversal of 86911621 is 12611968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85192900 + 1718721 = 9230^2 + 1311^2 .

It is a cyclic number.

It is not a de Polignac number, because 86911621 - 2¹ = 86911619 is a prime.

Together with 86911619, it forms a pair of twin primes.

It is equal to p_5048386 and since 86911621 and 5048386 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86911421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43455810 + 43455811.

It is an arithmetic number, because the mean of its divisors is an integer number (43455811).

Almost surely, 2^86911621 is an apocalyptic number.

It is an amenable number.

86911621 is a deficient number, since it is larger than the sum of its proper divisors (1).

86911621 is an equidigital number, since it uses as much as digits as its factorization.

86911621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 86911621 is about 9322.6402376151. The cubic root of 86911621 is about 442.9546685912.

The spelling of 86911621 in words is "eighty-six million, nine hundred eleven thousand, six hundred twenty-one".