199991377 has 2 divisors, whose sum is σ = 199991378. Its totient is φ = 199991376.

The previous prime is 199991369. The next prime is 199991381. The reversal of 199991377 is 773199991.

199991377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152670736 + 47320641 = 12356^2 + 6879^2 .

It is a cyclic number.

It is not a de Polignac number, because 199991377 - 2³ = 199991369 is a prime.

It is a super-2 number, since 2×199991377² = 79993101748712258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199991357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99995688 + 99995689.

It is an arithmetic number, because the mean of its divisors is an integer number (99995689).

Almost surely, 2^199991377 is an apocalyptic number.

It is an amenable number.

199991377 is a deficient number, since it is larger than the sum of its proper divisors (1).

199991377 is an equidigital number, since it uses as much as digits as its factorization.

199991377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 964467, while the sum is 55.

The square root of 199991377 is about 14141.8307513561. The cubic root of 199991377 is about 584.7951429201.

The spelling of 199991377 in words is "one hundred ninety-nine million, nine hundred ninety-one thousand, three hundred seventy-seven".