1988063989 has 2 divisors, whose sum is σ = 1988063990. Its totient is φ = 1988063988.

The previous prime is 1988063953. The next prime is 1988064011. The reversal of 1988063989 is 9893608891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1366559089 + 621504900 = 36967^2 + 24930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1988063989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988063789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994031994 + 994031995.

It is an arithmetic number, because the mean of its divisors is an integer number (994031995).

Almost surely, 2^1988063989 is an apocalyptic number.

It is an amenable number.

1988063989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988063989 is an equidigital number, since it uses as much as digits as its factorization.

1988063989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 61.

The square root of 1988063989 is about 44587.7111881738. The cubic root of 1988063989 is about 1257.4096419653.

The spelling of 1988063989 in words is "one billion, nine hundred eighty-eight million, sixty-three thousand, nine hundred eighty-nine".