1020202509 has 4 divisors (see below), whose sum is σ = 1360270016. Its totient is φ = 680135004.

The previous prime is 1020202507. The next prime is 1020202523. The reversal of 1020202509 is 9052020201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1020202509 - 2¹ = 1020202507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020202507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170033749 + ... + 170033754.

It is an arithmetic number, because the mean of its divisors is an integer number (340067504).

Almost surely, 2^1020202509 is an apocalyptic number.

It is an amenable number.

1020202509 is a deficient number, since it is larger than the sum of its proper divisors (340067507).

1020202509 is an equidigital number, since it uses as much as digits as its factorization.

1020202509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340067506.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1020202509 is about 31940.6090893709. The cubic root of 1020202509 is about 1006.6893228507.

The spelling of 1020202509 in words is "one billion, twenty million, two hundred two thousand, five hundred nine".