199970657 has 2 divisors, whose sum is σ = 199970658. Its totient is φ = 199970656.

The previous prime is 199970651. The next prime is 199970663. The reversal of 199970657 is 756079991.

It is a balanced prime because it is at equal distance from previous prime (199970651) and next prime (199970663).

It can be written as a sum of positive squares in only one way, i.e., 194993296 + 4977361 = 13964^2 + 2231^2 .

It is an emirp because it is prime and its reverse (756079991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199970657 - 2⁸ = 199970401 is a prime.

It is a super-2 number, since 2×199970657² = 79976527322023298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199970599 and 199970608.

It is not a weakly prime, because it can be changed into another prime (199970651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99985328 + 99985329.

It is an arithmetic number, because the mean of its divisors is an integer number (99985329).

Almost surely, 2^199970657 is an apocalyptic number.

It is an amenable number.

199970657 is a deficient number, since it is larger than the sum of its proper divisors (1).

199970657 is an equidigital number, since it uses as much as digits as its factorization.

199970657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1071630, while the sum is 53.

The square root of 199970657 is about 14141.0981539624. The cubic root of 199970657 is about 584.7749464263.

The spelling of 199970657 in words is "one hundred ninety-nine million, nine hundred seventy thousand, six hundred fifty-seven".