19220217769 has 3 divisors (see below), whose sum is σ = 19220356407. Its totient is φ = 19220079132.

The previous prime is 19220217761. The next prime is 19220217811. The reversal of 19220217769 is 96771202291.

It is a happy number.

The square root of 19220217769 is 138637.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96771202291 = 643 ⋅150499537.

It can be written as a sum of positive squares in only one way, i.e., 8318352025 + 10901865744 = 91205^2 + 104412^2 .

It is not a de Polignac number, because 19220217769 - 2³ = 19220217761 is a prime.

It is a super-2 number, since 2×19220217769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19220217761) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 69319 + ... + 207955.

It is an arithmetic number, because the mean of its divisors is an integer number (6406785469).

Almost surely, 2^19220217769 is an apocalyptic number.

19220217769 is the 138637-th square number.

19220217769 is the 69319-th centered octagonal number.

It is an amenable number.

19220217769 is a deficient number, since it is larger than the sum of its proper divisors (138638).

19220217769 is an frugal number, since it uses more digits than its factorization.

19220217769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277274 (or 138637 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 19220217769 in words is "nineteen billion, two hundred twenty million, two hundred seventeen thousand, seven hundred sixty-nine".