19619819101 has 2 divisors, whose sum is σ = 19619819102. Its totient is φ = 19619819100.

The previous prime is 19619819081. The next prime is 19619819147. The reversal of 19619819101 is 10191891691.

It is an a-pointer prime, because the next prime (19619819147) can be obtained adding 19619819101 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19016134201 + 603684900 = 137899^2 + 24570^2 .

It is a cyclic number.

It is not a de Polignac number, because 19619819101 - 2²⁵ = 19586264669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19619819201) 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 as a sum of consecutive naturals, namely, 9809909550 + 9809909551.

It is an arithmetic number, because the mean of its divisors is an integer number (9809909551).

Almost surely, 2^19619819101 is an apocalyptic number.

It is an amenable number.

19619819101 is a deficient number, since it is larger than the sum of its proper divisors (1).

19619819101 is an equidigital number, since it uses as much as digits as its factorization.

19619819101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 46.

The spelling of 19619819101 in words is "nineteen billion, six hundred nineteen million, eight hundred nineteen thousand, one hundred one".