199609057 has 2 divisors, whose sum is σ = 199609058. Its totient is φ = 199609056.

The previous prime is 199609037. The next prime is 199609097. The reversal of 199609057 is 750906991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195888016 + 3721041 = 13996^2 + 1929^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199609057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199608998 and 199609016.

It is not a weakly prime, because it can be changed into another prime (199609037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99804528 + 99804529.

It is an arithmetic number, because the mean of its divisors is an integer number (99804529).

Almost surely, 2^199609057 is an apocalyptic number.

It is an amenable number.

199609057 is a deficient number, since it is larger than the sum of its proper divisors (1).

199609057 is an equidigital number, since it uses as much as digits as its factorization.

199609057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 199609057 is about 14128.3069403237. The cubic root of 199609057 is about 584.4222576746.

The spelling of 199609057 in words is "one hundred ninety-nine million, six hundred nine thousand, fifty-seven".