193690561 has 2 divisors, whose sum is σ = 193690562. Its totient is φ = 193690560.

The previous prime is 193690559. The next prime is 193690589. The reversal of 193690561 is 165096391.

193690561 is nontrivially palindromic in base 9.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176384961 + 17305600 = 13281^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 193690561 - 2¹ = 193690559 is a prime.

Together with 193690559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (193690591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96845280 + 96845281.

It is an arithmetic number, because the mean of its divisors is an integer number (96845281).

Almost surely, 2^193690561 is an apocalyptic number.

It is an amenable number.

193690561 is a deficient number, since it is larger than the sum of its proper divisors (1).

193690561 is an equidigital number, since it uses as much as digits as its factorization.

193690561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 193690561 is about 13917.2756313871. The cubic root of 193690561 is about 578.5880847369.

The spelling of 193690561 in words is "one hundred ninety-three million, six hundred ninety thousand, five hundred sixty-one".