193195661 has 2 divisors, whose sum is σ = 193195662. Its totient is φ = 193195660.

The previous prime is 193195631. The next prime is 193195663. The reversal of 193195661 is 166591391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161442436 + 31753225 = 12706^2 + 5635^2 .

It is a cyclic number.

It is not a de Polignac number, because 193195661 - 2¹⁰ = 193194637 is a prime.

Together with 193195663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193195663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96597830 + 96597831.

It is an arithmetic number, because the mean of its divisors is an integer number (96597831).

Almost surely, 2^193195661 is an apocalyptic number.

It is an amenable number.

193195661 is a deficient number, since it is larger than the sum of its proper divisors (1).

193195661 is an equidigital number, since it uses as much as digits as its factorization.

193195661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 41.

The square root of 193195661 is about 13899.4841990629. The cubic root of 193195661 is about 578.0948797203.

The spelling of 193195661 in words is "one hundred ninety-three million, one hundred ninety-five thousand, six hundred sixty-one".