17872213969 has 9 divisors (see below), whose sum is σ = 18303399963. Its totient is φ = 17450966232.

The previous prime is 17872213949. The next prime is 17872213999. The reversal of 17872213969 is 96931227871.

It is a happy number.

The square root of 17872213969 is 133687.

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

It can be written as a sum of positive squares in only one way, i.e., 3168226369 + 14703987600 = 56287^2 + 121260^2 .

It is not a de Polignac number, because 17872213969 - 2¹¹ = 17872211921 is a prime.

It is a super-2 number, since 2×17872213969² (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 (17872213939) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5746987 + ... + 5750095.

It is an arithmetic number, because the mean of its divisors is an integer number (2033711107).

Almost surely, 2^17872213969 is an apocalyptic number.

17872213969 is the 133687-th square number.

17872213969 is the 66844-th centered octagonal number.

It is an amenable number.

17872213969 is a deficient number, since it is larger than the sum of its proper divisors (431185994).

17872213969 is an frugal number, since it uses more digits than its factorization.

17872213969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6304 (or 3152 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The spelling of 17872213969 in words is "seventeen billion, eight hundred seventy-two million, two hundred thirteen thousand, nine hundred sixty-nine".