199121071 has 2 divisors, whose sum is σ = 199121072. Its totient is φ = 199121070.

The previous prime is 199121033. The next prime is 199121077. The reversal of 199121071 is 170121991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199121071 - 2¹¹ = 199119023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199121077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99560535 + 99560536.

It is an arithmetic number, because the mean of its divisors is an integer number (99560536).

Almost surely, 2^199121071 is an apocalyptic number.

199121071 is a deficient number, since it is larger than the sum of its proper divisors (1).

199121071 is an equidigital number, since it uses as much as digits as its factorization.

199121071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 199121071 is about 14111.0265749874. The cubic root of 199121071 is about 583.9456216569.

The spelling of 199121071 in words is "one hundred ninety-nine million, one hundred twenty-one thousand, seventy-one".