1535789989 has 2 divisors, whose sum is σ = 1535789990. Its totient is φ = 1535789988.

The previous prime is 1535789977. The next prime is 1535789993. The reversal of 1535789989 is 9899875351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1512432100 + 23357889 = 38890^2 + 4833^2 .

It is an emirp because it is prime and its reverse (9899875351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1535789989 - 2¹⁵ = 1535757221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1535789989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1535789929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 767894994 + 767894995.

It is an arithmetic number, because the mean of its divisors is an integer number (767894995).

Almost surely, 2^1535789989 is an apocalyptic number.

It is an amenable number.

1535789989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1535789989 is an equidigital number, since it uses as much as digits as its factorization.

1535789989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24494400, while the sum is 64.

The square root of 1535789989 is about 39189.1565232017. The cubic root of 1535789989 is about 1153.7470690793.

The spelling of 1535789989 in words is "one billion, five hundred thirty-five million, seven hundred eighty-nine thousand, nine hundred eighty-nine".