193640561 has 2 divisors, whose sum is σ = 193640562. Its totient is φ = 193640560.

The previous prime is 193640543. The next prime is 193640597. The reversal of 193640561 is 165046391.

193640561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160174336 + 33466225 = 12656^2 + 5785^2 .

It is an emirp because it is prime and its reverse (165046391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193640561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (193640861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96820280 + 96820281.

It is an arithmetic number, because the mean of its divisors is an integer number (96820281).

Almost surely, 2^193640561 is an apocalyptic number.

It is an amenable number.

193640561 is a deficient number, since it is larger than the sum of its proper divisors (1).

193640561 is an equidigital number, since it uses as much as digits as its factorization.

193640561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 193640561 is about 13915.4791868624. The cubic root of 193640561 is about 578.5382941607.

The spelling of 193640561 in words is "one hundred ninety-three million, six hundred forty thousand, five hundred sixty-one".