192318208681 has 15 divisors (see below), whose sum is σ = 201302739831. Its totient is φ = 183734645688.

The previous prime is 192318208679. The next prime is 192318208739. The reversal of 192318208681 is 186802813291.

It is a happy number.

The square root of 192318208681 is 438541.

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., 110716573081 + 81601635600 = 332741^2 + 285660^2 .

It is not a de Polignac number, because 192318208681 - 2¹ = 192318208679 is a prime.

It is a super-2 number, since 2×192318208681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (192318208631) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 231987775 + ... + 231988603.

Almost surely, 2^192318208681 is an apocalyptic number.

192318208681 is the 438541-st square number.

192318208681 is the 219271-st centered octagonal number.

It is an amenable number.

192318208681 is a deficient number, since it is larger than the sum of its proper divisors (8984531150).

192318208681 is an frugal number, since it uses more digits than its factorization.

192318208681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

Multiplying 192318208681 by its sum of digits (49), we get a square (9423592225369 = 3069787²).

The spelling of 192318208681 in words is "one hundred ninety-two billion, three hundred eighteen million, two hundred eight thousand, six hundred eighty-one".