1023231209 has 16 divisors (see below), whose sum is σ = 1373850240. Its totient is φ = 735989760.

The previous prime is 1023231203. The next prime is 1023231227. The reversal of 1023231209 is 9021323201.

It is not a de Polignac number, because 1023231209 - 2⁴ = 1023231193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1023231203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510104 + ... + 512105.

It is an arithmetic number, because the mean of its divisors is an integer number (85865640).

Almost surely, 2^1023231209 is an apocalyptic number.

It is an amenable number.

1023231209 is a deficient number, since it is larger than the sum of its proper divisors (350619031).

1023231209 is a wasteful number, since it uses less digits than its factorization.

1023231209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022240.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1023231209 is about 31987.9853851411. The cubic root of 1023231209 is about 1007.6845330231.

It can be divided in two parts, 1023 and 231209, that added together give a palindrome (232232).

The spelling of 1023231209 in words is "one billion, twenty-three million, two hundred thirty-one thousand, two hundred nine".