1899101009 has 4 divisors (see below), whose sum is σ = 2045185716. Its totient is φ = 1753016304.

The previous prime is 1899101003. The next prime is 1899101011. The reversal of 1899101009 is 9001019981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 835036609 + 1064064400 = 28897^2 + 32620^2 .

It is not a de Polignac number, because 1899101009 - 2⁴ = 1899100993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1899101003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73042334 + ... + 73042359.

It is an arithmetic number, because the mean of its divisors is an integer number (511296429).

Almost surely, 2^1899101009 is an apocalyptic number.

It is an amenable number.

1899101009 is a deficient number, since it is larger than the sum of its proper divisors (146084707).

1899101009 is a wasteful number, since it uses less digits than its factorization.

1899101009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146084706.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 1899101009 is about 43578.6760813130. The cubic root of 1899101009 is about 1238.3669555871.

The spelling of 1899101009 in words is "one billion, eight hundred ninety-nine million, one hundred one thousand, nine".