199578073 has 2 divisors, whose sum is σ = 199578074. Its totient is φ = 199578072.

The previous prime is 199578047. The next prime is 199578133. The reversal of 199578073 is 370875991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193682889 + 5895184 = 13917^2 + 2428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199578073 is a prime.

It is not a weakly prime, because it can be changed into another prime (199578023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99789036 + 99789037.

It is an arithmetic number, because the mean of its divisors is an integer number (99789037).

Almost surely, 2^199578073 is an apocalyptic number.

It is an amenable number.

199578073 is a deficient number, since it is larger than the sum of its proper divisors (1).

199578073 is an equidigital number, since it uses as much as digits as its factorization.

199578073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 199578073 is about 14127.2103757253. The cubic root of 199578073 is about 584.3920174365.

The spelling of 199578073 in words is "one hundred ninety-nine million, five hundred seventy-eight thousand, seventy-three".