86611621 has 2 divisors, whose sum is σ = 86611622. Its totient is φ = 86611620.

The previous prime is 86611619. The next prime is 86611631. The reversal of 86611621 is 12611668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61058596 + 25553025 = 7814^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 86611621 - 2¹ = 86611619 is a prime.

Together with 86611619, 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 (86611601) 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, 43305810 + 43305811.

It is an arithmetic number, because the mean of its divisors is an integer number (43305811).

Almost surely, 2^86611621 is an apocalyptic number.

It is an amenable number.

86611621 is a deficient number, since it is larger than the sum of its proper divisors (1).

86611621 is an equidigital number, since it uses as much as digits as its factorization.

86611621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 86611621 is about 9306.5364663767. The cubic root of 86611621 is about 442.4444200144. Note that the first 4 decimals are identical.

The spelling of 86611621 in words is "eighty-six million, six hundred eleven thousand, six hundred twenty-one".