1019598989 has 2 divisors, whose sum is σ = 1019598990. Its totient is φ = 1019598988.

The previous prime is 1019598917. The next prime is 1019598991. The reversal of 1019598989 is 9898959101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1004256100 + 15342889 = 31690^2 + 3917^2 .

It is a cyclic number.

It is not a de Polignac number, because 1019598989 - 2¹⁶ = 1019533453 is a prime.

Together with 1019598991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019598289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509799494 + 509799495.

It is an arithmetic number, because the mean of its divisors is an integer number (509799495).

Almost surely, 2^1019598989 is an apocalyptic number.

It is an amenable number.

1019598989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019598989 is an equidigital number, since it uses as much as digits as its factorization.

1019598989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 59.

The square root of 1019598989 is about 31931.1601574387. The cubic root of 1019598989 is about 1006.4907750205.

The spelling of 1019598989 in words is "one billion, nineteen million, five hundred ninety-eight thousand, nine hundred eighty-nine".