1023020309 has 2 divisors, whose sum is σ = 1023020310. Its totient is φ = 1023020308.

The previous prime is 1023020303. The next prime is 1023020311. The reversal of 1023020309 is 9030203201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 843728209 + 179292100 = 29047^2 + 13390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023020309 - 2²⁰ = 1021971733 is a prime.

Together with 1023020311, 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 (1023020303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511510154 + 511510155.

It is an arithmetic number, because the mean of its divisors is an integer number (511510155).

Almost surely, 2^1023020309 is an apocalyptic number.

It is an amenable number.

1023020309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023020309 is an equidigital number, since it uses as much as digits as its factorization.

1023020309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1023020309 is about 31984.6886650472. The cubic root of 1023020309 is about 1007.6152963837.

The spelling of 1023020309 in words is "one billion, twenty-three million, twenty thousand, three hundred nine".