192681989 has 2 divisors, whose sum is σ = 192681990. Its totient is φ = 192681988.

The previous prime is 192681959. The next prime is 192681991. The reversal of 192681989 is 989186291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103530625 + 89151364 = 10175^2 + 9442^2 .

It is an emirp because it is prime and its reverse (989186291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 192681989 - 2¹⁶ = 192616453 is a prime.

It is a super-2 number, since 2×192681989² = 74252697769992242, which contains 22 as substring.

Together with 192681991, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 192681989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (192681959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96340994 + 96340995.

It is an arithmetic number, because the mean of its divisors is an integer number (96340995).

Almost surely, 2^192681989 is an apocalyptic number.

It is an amenable number.

192681989 is a deficient number, since it is larger than the sum of its proper divisors (1).

192681989 is an equidigital number, since it uses as much as digits as its factorization.

192681989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 53.

The square root of 192681989 is about 13880.9938044796. The cubic root of 192681989 is about 577.5820753771.

The spelling of 192681989 in words is "one hundred ninety-two million, six hundred eighty-one thousand, nine hundred eighty-nine".