19901099009 has 16 divisors (see below), whose sum is σ = 21897609216. Its totient is φ = 17936024400.

The previous prime is 19901098969. The next prime is 19901099021. The reversal of 19901099009 is 90099010991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19901099009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19901029009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2184554 + ... + 2193644.

It is an arithmetic number, because the mean of its divisors is an integer number (1368600576).

Almost surely, 2^19901099009 is an apocalyptic number.

It is an amenable number.

19901099009 is a deficient number, since it is larger than the sum of its proper divisors (1996510207).

19901099009 is a wasteful number, since it uses less digits than its factorization.

19901099009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10796.

The product of its (nonzero) digits is 59049, while the sum is 47.

The spelling of 19901099009 in words is "nineteen billion, nine hundred one million, ninety-nine thousand, nine".