199979051 has 2 divisors, whose sum is σ = 199979052. Its totient is φ = 199979050.

The previous prime is 199979029. The next prime is 199979053. The reversal of 199979051 is 150979991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199979051 - 2²⁶ = 132870187 is a prime.

It is a Sophie Germain prime.

Together with 199979053, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199979053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99989525 + 99989526.

It is an arithmetic number, because the mean of its divisors is an integer number (99989526).

Almost surely, 2^199979051 is an apocalyptic number.

199979051 is a deficient number, since it is larger than the sum of its proper divisors (1).

199979051 is an equidigital number, since it uses as much as digits as its factorization.

199979051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229635, while the sum is 50.

The square root of 199979051 is about 14141.3949453369. The cubic root of 199979051 is about 584.7831285138.

The spelling of 199979051 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, fifty-one".