1023012209 has 4 divisors (see below), whose sum is σ = 1023078720. Its totient is φ = 1022945700.

The previous prime is 1023012203. The next prime is 1023012227. The reversal of 1023012209 is 9022103201.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023012209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1023012203) 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, 2972 + ... + 45330.

It is an arithmetic number, because the mean of its divisors is an integer number (255769680).

Almost surely, 2^1023012209 is an apocalyptic number.

It is an amenable number.

1023012209 is a deficient number, since it is larger than the sum of its proper divisors (66511).

1023012209 is an equidigital number, since it uses as much as digits as its factorization.

1023012209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66510.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1023012209 is about 31984.5620417101. The cubic root of 1023012209 is about 1007.6126370343.

The spelling of 1023012209 in words is "one billion, twenty-three million, twelve thousand, two hundred nine".