195039661 has 2 divisors, whose sum is σ = 195039662. Its totient is φ = 195039660.

The previous prime is 195039641. The next prime is 195039671. The reversal of 195039661 is 166930591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148718025 + 46321636 = 12195^2 + 6806^2 .

It is a cyclic number.

It is not a de Polignac number, because 195039661 - 2¹¹ = 195037613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195039601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97519830 + 97519831.

It is an arithmetic number, because the mean of its divisors is an integer number (97519831).

Almost surely, 2^195039661 is an apocalyptic number.

It is an amenable number.

195039661 is a deficient number, since it is larger than the sum of its proper divisors (1).

195039661 is an equidigital number, since it uses as much as digits as its factorization.

195039661 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 195039661 is about 13965.6600631692. The cubic root of 195039661 is about 579.9283115915.

The spelling of 195039661 in words is "one hundred ninety-five million, thirty-nine thousand, six hundred sixty-one".