65036581 has 2 divisors, whose sum is σ = 65036582. Its totient is φ = 65036580.

The previous prime is 65036567. The next prime is 65036593. The reversal of 65036581 is 18563056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47472100 + 17564481 = 6890^2 + 4191^2 .

It is a cyclic number.

It is not a de Polignac number, because 65036581 - 2⁵ = 65036549 is a prime.

It is a super-2 number, since 2×65036581² = 8459513736339122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65036551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32518290 + 32518291.

It is an arithmetic number, because the mean of its divisors is an integer number (32518291).

Almost surely, 2^65036581 is an apocalyptic number.

It is an amenable number.

65036581 is a deficient number, since it is larger than the sum of its proper divisors (1).

65036581 is an equidigital number, since it uses as much as digits as its factorization.

65036581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 65036581 is about 8064.5260865100. The cubic root of 65036581 is about 402.1479884670.

The spelling of 65036581 in words is "sixty-five million, thirty-six thousand, five hundred eighty-one".