199961417 has 2 divisors, whose sum is σ = 199961418. Its totient is φ = 199961416.

The previous prime is 199961407. The next prime is 199961423. The reversal of 199961417 is 714169991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147962896 + 51998521 = 12164^2 + 7211^2 .

It is a cyclic number.

It is not a de Polignac number, because 199961417 - 2⁴ = 199961401 is a prime.

It is not a weakly prime, because it can be changed into another prime (199961407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99980708 + 99980709.

It is an arithmetic number, because the mean of its divisors is an integer number (99980709).

Almost surely, 2^199961417 is an apocalyptic number.

It is an amenable number.

199961417 is a deficient number, since it is larger than the sum of its proper divisors (1).

199961417 is an equidigital number, since it uses as much as digits as its factorization.

199961417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 199961417 is about 14140.7714428881. The cubic root of 199961417 is about 584.7659394319.

The spelling of 199961417 in words is "one hundred ninety-nine million, nine hundred sixty-one thousand, four hundred seventeen".