199979057 has 2 divisors, whose sum is σ = 199979058. Its totient is φ = 199979056.

The previous prime is 199979053. The next prime is 199979069. The reversal of 199979057 is 750979991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165920161 + 34058896 = 12881^2 + 5836^2 .

It is a cyclic number.

It is not a de Polignac number, because 199979057 - 2² = 199979053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199978993 and 199979011.

It is not a weakly prime, because it can be changed into another prime (199979051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99989528 + 99989529.

It is an arithmetic number, because the mean of its divisors is an integer number (99989529).

Almost surely, 2^199979057 is an apocalyptic number.

It is an amenable number.

199979057 is a deficient number, since it is larger than the sum of its proper divisors (1).

199979057 is an equidigital number, since it uses as much as digits as its factorization.

199979057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1607445, while the sum is 56.

The square root of 199979057 is about 14141.3951574800. The cubic root of 199979057 is about 584.7831343622.

The spelling of 199979057 in words is "one hundred ninety-nine million, nine hundred seventy-nine thousand, fifty-seven".