1231022331009 has 32 divisors (see below), whose sum is σ = 1853103882240. Its totient is φ = 807494781456.

The previous prime is 1231022330999. The next prime is 1231022331017. The reversal of 1231022331009 is 9001332201321.

1231022331009 is a `hidden beast` number, since 12 + 310 + 2 + 2 + 331 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 1231022331009 - 2¹¹ = 1231022328961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1231022331109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1166904 + ... + 1955430.

It is an arithmetic number, because the mean of its divisors is an integer number (57909496320).

Almost surely, 2^{1231022331009} is an apocalyptic number.

It is an amenable number.

1231022331009 is a deficient number, since it is larger than the sum of its proper divisors (622081551231).

1231022331009 is an equidigital number, since it uses as much as digits as its factorization.

1231022331009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789466 (or 789460 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 1231022331009 in words is "one trillion, two hundred thirty-one billion, twenty-two million, three hundred thirty-one thousand, nine".