199549273369 has 2 divisors, whose sum is σ = 199549273370. Its totient is φ = 199549273368.

The previous prime is 199549273277. The next prime is 199549273421. The reversal of 199549273369 is 963372945991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197842592025 + 1706681344 = 444795^2 + 41312^2 .

It is a cyclic number.

It is not a de Polignac number, because 199549273369 - 2⁷ = 199549273241 is a prime.

It is a super-2 number, since 2×199549273369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (199549276369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99774636684 + 99774636685.

It is an arithmetic number, because the mean of its divisors is an integer number (99774636685).

Almost surely, 2^199549273369 is an apocalyptic number.

It is an amenable number.

199549273369 is a deficient number, since it is larger than the sum of its proper divisors (1).

199549273369 is an equidigital number, since it uses as much as digits as its factorization.

199549273369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99202320, while the sum is 67.

The spelling of 199549273369 in words is "one hundred ninety-nine billion, five hundred forty-nine million, two hundred seventy-three thousand, three hundred sixty-nine".