199102905 has 36 divisors (see below), whose sum is σ = 349130340. Its totient is φ = 104963904.

The previous prime is 199102903. The next prime is 199102909. The reversal of 199102905 is 509201991.

It can be written as a sum of positive squares in 2 ways, for example, as 136328976 + 62773929 = 11676^2 + 7923^2 .

It is not a de Polignac number, because 199102905 - 2¹ = 199102903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199102905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199102903) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 869331 + ... + 869559.

It is an arithmetic number, because the mean of its divisors is an integer number (9698065).

Almost surely, 2^199102905 is an apocalyptic number.

199102905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199102905 is a deficient number, since it is larger than the sum of its proper divisors (150027435).

199102905 is a wasteful number, since it uses less digits than its factorization.

199102905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 199102905 is about 14110.3828792843. The cubic root of 199102905 is about 583.9278631500.

The spelling of 199102905 in words is "one hundred ninety-nine million, one hundred two thousand, nine hundred five".