86993581 has 2 divisors, whose sum is σ = 86993582. Its totient is φ = 86993580.

The previous prime is 86993561. The next prime is 86993629. The reversal of 86993581 is 18539968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50197225 + 36796356 = 7085^2 + 6066^2 .

It is a cyclic number.

It is not a de Polignac number, because 86993581 - 2⁷ = 86993453 is a prime.

It is a super-2 number, since 2×86993581² = 15135766270407122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86993551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43496790 + 43496791.

It is an arithmetic number, because the mean of its divisors is an integer number (43496791).

Almost surely, 2^86993581 is an apocalyptic number.

It is an amenable number.

86993581 is a deficient number, since it is larger than the sum of its proper divisors (1).

86993581 is an equidigital number, since it uses as much as digits as its factorization.

86993581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The square root of 86993581 is about 9327.0349522236. The cubic root of 86993581 is about 443.0938642405.

The spelling of 86993581 in words is "eighty-six million, nine hundred ninety-three thousand, five hundred eighty-one".