86695621 has 2 divisors, whose sum is σ = 86695622. Its totient is φ = 86695620.

The previous prime is 86695619. The next prime is 86695633. The reversal of 86695621 is 12659668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86694721 + 900 = 9311^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 86695621 - 2¹ = 86695619 is a prime.

It is a super-2 number, since 2×86695621² = 15032261401151282, which contains 22 as substring.

Together with 86695619, 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 (86695681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43347810 + 43347811.

It is an arithmetic number, because the mean of its divisors is an integer number (43347811).

Almost surely, 2^86695621 is an apocalyptic number.

It is an amenable number.

86695621 is a deficient number, since it is larger than the sum of its proper divisors (1).

86695621 is an equidigital number, since it uses as much as digits as its factorization.

86695621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 86695621 is about 9311.0483298069. The cubic root of 86695621 is about 442.5874082279.

The spelling of 86695621 in words is "eighty-six million, six hundred ninety-five thousand, six hundred twenty-one".