199101979 has 2 divisors, whose sum is σ = 199101980. Its totient is φ = 199101978.

The previous prime is 199101953. The next prime is 199102003. The reversal of 199101979 is 979101991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199101979 - 2²¹ = 197004827 is a prime.

It is not a weakly prime, because it can be changed into another prime (199101949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99550989 + 99550990.

It is an arithmetic number, because the mean of its divisors is an integer number (99550990).

Almost surely, 2^199101979 is an apocalyptic number.

199101979 is a deficient number, since it is larger than the sum of its proper divisors (1).

199101979 is an equidigital number, since it uses as much as digits as its factorization.

199101979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 46.

The square root of 199101979 is about 14110.3500665292. The cubic root of 199101979 is about 583.9269578927.

The spelling of 199101979 in words is "one hundred ninety-nine million, one hundred one thousand, nine hundred seventy-nine".