73085561 has 2 divisors, whose sum is σ = 73085562. Its totient is φ = 73085560.

The previous prime is 73085549. The next prime is 73085563. The reversal of 73085561 is 16558037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 28783225 = 6656^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 73085561 - 2⁶ = 73085497 is a prime.

Together with 73085563, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4288814 and since 73085561 and 4288814 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (73085563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36542780 + 36542781.

It is an arithmetic number, because the mean of its divisors is an integer number (36542781).

Almost surely, 2^73085561 is an apocalyptic number.

It is an amenable number.

73085561 is a deficient number, since it is larger than the sum of its proper divisors (1).

73085561 is an equidigital number, since it uses as much as digits as its factorization.

73085561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 73085561 is about 8549.0093578145. The cubic root of 73085561 is about 418.0971382801.

The spelling of 73085561 in words is "seventy-three million, eighty-five thousand, five hundred sixty-one".