86595781 has 2 divisors, whose sum is σ = 86595782. Its totient is φ = 86595780.

The previous prime is 86595779. The next prime is 86595793. The reversal of 86595781 is 18759568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79121025 + 7474756 = 8895^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 86595781 - 2¹ = 86595779 is a prime.

It is a super-2 number, since 2×86595781² = 14997658573999922, which contains 22 as substring.

Together with 86595779, 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 (86595701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43297890 + 43297891.

It is an arithmetic number, because the mean of its divisors is an integer number (43297891).

Almost surely, 2^86595781 is an apocalyptic number.

It is an amenable number.

86595781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86595781 is an equidigital number, since it uses as much as digits as its factorization.

86595781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 49.

The square root of 86595781 is about 9305.6854126926. The cubic root of 86595781 is about 442.4174461634.

The spelling of 86595781 in words is "eighty-six million, five hundred ninety-five thousand, seven hundred eighty-one".