1230020509 has 2 divisors, whose sum is σ = 1230020510. Its totient is φ = 1230020508.

The previous prime is 1230020453. The next prime is 1230020549. The reversal of 1230020509 is 9050200321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825125625 + 404894884 = 28725^2 + 20122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230020509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1230020509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230020549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615010254 + 615010255.

It is an arithmetic number, because the mean of its divisors is an integer number (615010255).

Almost surely, 2^1230020509 is an apocalyptic number.

It is an amenable number.

1230020509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230020509 is an equidigital number, since it uses as much as digits as its factorization.

1230020509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1230020509 is about 35071.6482218900. The cubic root of 1230020509 is about 1071.4472247224.

The spelling of 1230020509 in words is "one billion, two hundred thirty million, twenty thousand, five hundred nine".