1231023009 has 8 divisors (see below), whose sum is σ = 1641798720. Its totient is φ = 820464656.

The previous prime is 1231023007. The next prime is 1231023067. The reversal of 1231023009 is 9003201321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231023009 - 2¹ = 1231023007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231023007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40629 + ... + 64130.

It is an arithmetic number, because the mean of its divisors is an integer number (205224840).

Almost surely, 2^1231023009 is an apocalyptic number.

It is an amenable number.

1231023009 is a deficient number, since it is larger than the sum of its proper divisors (410775711).

1231023009 is a wasteful number, since it uses less digits than its factorization.

1231023009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108679.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1231023009 is about 35085.9374821309. The cubic root of 1231023009 is about 1071.7382318379.

The spelling of 1231023009 in words is "one billion, two hundred thirty-one million, twenty-three thousand, nine".