199195961 has 2 divisors, whose sum is σ = 199195962. Its totient is φ = 199195960.

The previous prime is 199195951. The next prime is 199195993. The reversal of 199195961 is 169591991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143544361 + 55651600 = 11981^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 199195961 - 2¹⁴ = 199179577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199195921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99597980 + 99597981.

It is an arithmetic number, because the mean of its divisors is an integer number (99597981).

Almost surely, 2^199195961 is an apocalyptic number.

It is an amenable number.

199195961 is a deficient number, since it is larger than the sum of its proper divisors (1).

199195961 is an equidigital number, since it uses as much as digits as its factorization.

199195961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196830, while the sum is 50.

The square root of 199195961 is about 14113.6799241020. The cubic root of 199195961 is about 584.0188203496.

The spelling of 199195961 in words is "one hundred ninety-nine million, one hundred ninety-five thousand, nine hundred sixty-one".