69085561 has 2 divisors, whose sum is σ = 69085562. Its totient is φ = 69085560.

The previous prime is 69085559. The next prime is 69085567. The reversal of 69085561 is 16558096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47183161 + 21902400 = 6869^2 + 4680^2 .

It is a cyclic number.

It is not a de Polignac number, because 69085561 - 2¹ = 69085559 is a prime.

Together with 69085559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (69085567) 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, 34542780 + 34542781.

It is an arithmetic number, because the mean of its divisors is an integer number (34542781).

Almost surely, 2^69085561 is an apocalyptic number.

It is an amenable number.

69085561 is a deficient number, since it is larger than the sum of its proper divisors (1).

69085561 is an equidigital number, since it uses as much as digits as its factorization.

69085561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 69085561 is about 8311.7724343247. The cubic root of 69085561 is about 410.3260563170.

The spelling of 69085561 in words is "sixty-nine million, eighty-five thousand, five hundred sixty-one".