19909492201 has 3 divisors (see below), whose sum is σ = 19909633303. Its totient is φ = 19909351100.

The previous prime is 19909492181. The next prime is 19909492243. The reversal of 19909492201 is 10229490991.

The square root of 19909492201 is 141101.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 19224099801 + 685392400 = 138651^2 + 26180^2 .

It is not a de Polignac number, because 19909492201 - 2¹³ = 19909484009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19909492271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70551 + ... + 211651.

Almost surely, 2^19909492201 is an apocalyptic number.

19909492201 is the 141101-st square number.

19909492201 is the 70551-st centered octagonal number.

It is an amenable number.

19909492201 is a deficient number, since it is larger than the sum of its proper divisors (141102).

19909492201 is an frugal number, since it uses more digits than its factorization.

19909492201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282202 (or 141101 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 46.

The spelling of 19909492201 in words is "nineteen billion, nine hundred nine million, four hundred ninety-two thousand, two hundred one".