819799101261 has 24 divisors (see below), whose sum is σ = 1424546477120. Its totient is φ = 443801016576.

The previous prime is 819799101217. The next prime is 819799101281. The reversal of 819799101261 is 162101997918.

819799101261 is a `hidden beast` number, since 8 + 197 + 99 + 101 + 261 = 666.

It is not a de Polignac number, because 819799101261 - 2¹⁵ = 819799068493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 819799101198 and 819799101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819799101281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342437860 + ... + 342440253.

Almost surely, 2^819799101261 is an apocalyptic number.

It is an amenable number.

819799101261 is a deficient number, since it is larger than the sum of its proper divisors (604747375859).

819799101261 is a wasteful number, since it uses less digits than its factorization.

819799101261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684878145 (or 684878142 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 54.

The spelling of 819799101261 in words is "eight hundred nineteen billion, seven hundred ninety-nine million, one hundred one thousand, two hundred sixty-one".