1968434989 has 2 divisors, whose sum is σ = 1968434990. Its totient is φ = 1968434988.

The previous prime is 1968434987. The next prime is 1968435019. The reversal of 1968434989 is 9894348691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1822436100 + 145998889 = 42690^2 + 12083^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968434989 - 2¹ = 1968434987 is a prime.

Together with 1968434987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968434987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984217494 + 984217495.

It is an arithmetic number, because the mean of its divisors is an integer number (984217495).

Almost surely, 2^1968434989 is an apocalyptic number.

It is an amenable number.

1968434989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968434989 is an equidigital number, since it uses as much as digits as its factorization.

1968434989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 61.

The square root of 1968434989 is about 44367.0484594141. The cubic root of 1968434989 is about 1253.2576338689.

The spelling of 1968434989 in words is "one billion, nine hundred sixty-eight million, four hundred thirty-four thousand, nine hundred eighty-nine".