199190657 has 2 divisors, whose sum is σ = 199190658. Its totient is φ = 199190656.

The previous prime is 199190627. The next prime is 199190659. The reversal of 199190657 is 756091991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182142016 + 17048641 = 13496^2 + 4129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199190657 is a prime.

Together with 199190659, 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 (199190659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99595328 + 99595329.

It is an arithmetic number, because the mean of its divisors is an integer number (99595329).

Almost surely, 2^199190657 is an apocalyptic number.

It is an amenable number.

199190657 is a deficient number, since it is larger than the sum of its proper divisors (1).

199190657 is an equidigital number, since it uses as much as digits as its factorization.

199190657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 199190657 is about 14113.4920200495. The cubic root of 199190657 is about 584.0136367382.

The spelling of 199190657 in words is "one hundred ninety-nine million, one hundred ninety thousand, six hundred fifty-seven".